University Of Cambridge Faculty

"No physicist could tolerate religious dogma or extremism, but I have found that Christianity provides answers to the deeper questions about life and purpose which are beyond the range of science to answer. To me it is nonsense to claim, as some atheists do, that there is nothing worth knowing that is beyond the range of science. Religion is unfashionable in our current materialistic and consumer society, but I have not found Nobel Laureates to be especially atheistic. Accurate statistics are not available, and atheists tend to make more noise, but I know at least 6 examples amongst living physics laureates who are Christians. Being religious means accepting mystery, but so does physics. Things like quantum entanglement, where I can do something to an electron in the lab, and another electron at the edge of the Universe will respond instantly, are not understandable."

"I’m convinced that science is as deep a human instinctive activity as art or storytelling or music."

"One of the main functions of an analogy or model is to suggest extensions of the theory by considering extensions of the analogy, since more is known about the analogy than is known about the subject matter of the theory itself... A collection of observable concepts in a purely formal hypothesis suggesting no analogy with anything would consequently not suggest either any directions for its own development."

"A theory in its scientific context is not a static museum piece, but is always being extended and modified to account for new phenomena."

"These three assumptions between them constitute a picture of science and the world somewhat as follows : there is an external world which can in principle be exhaustively described in scientific language. The scientist, as both observer and language-user, can capture the external facts of the world in prepositions that are true if they correspond to the facts and false if they do not. Science is ideally a linguistic system in which true propositions are in one-to-one relation to facts, including facts that are not directly observed because they involve hidden entities or properties, or past events or far distant events. These hidden events are described in theories, and theories can be inferred from observation, that is the hidden explanatory mechanism of the world can be discovered from what is open to observation. Man as scientist is regarded as standing apart from the world and able to experiment and theorize about it objectively and dispassionately."

"It could plausibly be argued that far from Christian theology having hampered the study of nature for fifteen hundred years , it was Greek corruptions of biblical Christianity which had hampered it , and the attitude to nature."

"This of course has always been the method of empirical science, which has been suspicious of deductive argumentation unchecked by reference to experiment; but in a more general sense, and outside the practice of science itself, scientists have sometimes been the greatest offenders in adhering to dogmatic ideas against all the evidence, especially when they have tended to limit 'experience' to laboratory experiment."

"Mr. Walcot says of his Water, that it was smooth, soft, cooling, and would not decay or putrify in many Years, no not in seven Years... But by its continuing so long in an unputrified State, I suspect there was Spirit of Salt in it, that came over in Distillation: For tho' distiiled common Water is known to keep longer without putrifying, than undistilled Water by reason of its greater purity; yet I found some of the good distiiled Sea-Water to putrify in some time after Distillation, but that which had in it Spirit of Salt never putrified."

"I find that a small Degree of Putrefaction in Water, kills Fish; but if, in order to prevent that Putrefacton, a few Drops of Spirit or Oil of Vitriol be dropped into the Water, then the Fish will live many Days in that Water."

"Being informed, while this Book was printing, that it was said that M.D. F.R.S. had long since made a like Proposal, for sweetning the Air of Ships, in a Treatise called Aëro-Chalinos, or a Register for the Air, printed in the Year 1677... In which Book is the following Proposal, viz. In order to have the Benefit of Change of Air, to another Country or Climate, almost at any Season, and that without going out of the House; he would have a Room, which he calls an Air-Chamber, to be built... Air-tight every where; with a very large Pair of Organ-Bellows to be placed in the Room; to or from which, Air is to be conveyed through the Wall, by a Copper Pipe; with Valves to open inward or outward as Occasion shall require. With these Bellows, the Air in the Room is either to be condensed and made heavier, by forcing Air in, or lighter, by conveying Air out of the Room."

"I shall... give an Account of what has been formerly attempted for making Sea-Water drinkable, especially what was done by Mr. Walcot and Mr. Fitz-gerald in King Charles the Second's Time."

"St. Basil, in his Homilies, says that when Men were cast on an Island, where there was no fresh Water; and they boiled Sea-Water; and catched the Vapour with Sponges, which they squeezed into another Boiler; and having passed thus, four or five Times from Boilers thro' Sponges, it became drinkable. This tedious way was used before the method of Disttiling was known, which was an Invention of the Arabs."

"There is no doubt but it will fully answer your Lordships tender Care and Concern for the Welfare of Navigators, as it will contribute much to their Health, by supplying them, in exchange for a very noxious, with Plenty of fresh Air, that genuine Cordial of Life: For that wonderful Fluid the Air, which, by infinite Combinations with natural Bodies, produces surprizing Effects, as it is on the one Hand when pure, the chief Nourisher and Preserver of the Life of Animals and Vegetables; so, when foul and putrid, it is the great Principle of their Destruction."

"He proposes by this means to cure intermitting Fevers, by having the Air in the Room rarefied in the cold Fit, and condensed in the hot Fit; during the whole time of which, the Patient is to continue therein: And recommends the use of it, among other Distempers, to cure the Stone and the Pox."

"And if we reflect upon the discoveries that have been made in the animal œconomy, we shall find that the most considerable and rational accounts of it have been chiefly owing to the statical examination of their fluids, viz. by enquiring what quantity of fluids, and solids dissolved into fluids, the animal daily takes in for its support and nourishment: And with what force and different rapidities those fluids are carried about in their proper channels, according to the different secretions that are to be made from them: And in what proportion the recrementitious fluid is conveyed away, to make room for fresh supplies; and what portion of this recrement nature allots to be carried off, by the several kinds of emunctories and excretory ducts."

"And since in vegetables, their growth and the preservation of their vegetable life is promoted and maintained, as in animals, by the very plentiful and regular motion of their fluids, which are the vehicles ordained by nature, to carry proper nutriment to every part; it is therefore reasonable to hope, that in them also, by the same method of inquiry, considerable discoveries may in time be made, there being, in many respects, a great analogy between plants and animals."

"[It] is evident, not only from considering the Effects of the Engine, which exchanges great Quantities of bad, for good Air; but also from the Event it having been found very salutary by the Swedes who have made the Trial."

"He proposes also to prevent Sea-Sickness thereby, by having a Man thus shut up in a close Cabin in a compressed Air: This, I suppose, has led some to say, that this and my Proposal are the same. But bow wide is their Difference! My Ventilators are intended to promote a free Perspiration and Breathing, by conveying great Quantities of fresh Air into Ships, in exchange for very bad Air. On the contrary, Dr. Henshaw's Conetrivance would make a good Air, by confining it, very bad, and thereby retard Perspiration, and incommode the Breathing, and so cause, instead of preventing, Sickness... Besides, the Make of my Ventilators is very different from that of Organ-Bellows."

"As these Ventilators are like to prove of great Benefit to Mankind, in many other Respects than are here mentioned, or can as yet be thought of; so it will be of great use, if those who shall have made farther Improvements, will... communicate them; as also an Account of the Difficulties or Success they have met with in putting the Things here proposed in execution."

"As Sea-farers, that Valuable and Useful Part of Mankind, have many Hardships and Difficulties to contend with, so it is of great Importance to obviate as many of them as possible: And as the noxious Air in Ships has hitherto been one of their greatest Grievances, by making sick and destroying multitudes of them; so the finding a Means to prevent this great Evil, is of vastly more Consequence to Navigation, than the Discovery of the Longitude; as being a Means of saving innumerable more Lives..."

"The bodies which I distilled... (Fig. 38.) were Horn, calculus humanus, Oystershell, Oak, Mustard seed, Indian-wheat, se, Tobacco, oil of Anniseed, oil of Olives, Honey, Wax, Sugar, , , Earth, Walton Mineral, sea Salt, Salt-petre, Tartar, Sal Tartar, , Minium."

"As the celebrated Tar-water, recommended by the worthy and learned Bishop Berkeley, is said to be taken with great Benefit by some, and Detriment by others; I thought it might probably be of use to inquire whether any, or what Quantity of Tar, there was in Tar-water, made with different kinds of Tar, different Degrees of stirring, and in different Ways of making it. A short Account of which I shall give, without interesting myself, either in Favour or Disfavour of a Medicine that is under the Inspection of the proper Judges, as well as of all the rest of the World."

"'Tis a good Symptom that we are got upon a right Scent, when it leads not only to the Thing first sought for; but also to many other useful Discoveries, as we see this does."

"I am not a composer, I’m a clerk."

"Among the subjects which Hales regarded as of great importance was the liquor question. ...[In "Distilled Spirituous Liquors the Bane of the Nation"] he tries to arouse the interest of the landed gentry and the farming population on the ground that dram drinking decreases the appetite and lowers the demand for food. Then... he declares that... the country loses £600,000 per annum owing to the distilleries in London alone."

"Dr. Holmes has made us all familiar with the subject of Bishop Berkeley’s "Tar Water." ...Hales shows a praiseworthy caution. He does not deny its efficacy, but he does not advocate its use. ...In the book ["An Account of some Experiments and Observations on Tar-Water..."]... he confines himself entirely to the chemistry and preparation of tar water."

"Under his supervision the water supply of the [] parish was greatly improved..."

"The Gentleman's Magazine... contains... An Account of several methods to preserve Corn well by Ventilation: June, 1746, XVI... accompanied with plates [it] contained a careful and minute description of the construction of granaries, with calculations regarding the size of the ventilator and the amount of air required for drying a certain amount of a given kind of grain in layers of such a depth in granaries of such a size and so forth... showing his painstaking accuracy and his detailed knowledge of the subject."

"Not content with playing the part of a mere inventor, Hales added to that role... philanthropist, for seeing that it would be of great benefit to humanity, he wrote constantly on the subject and used what influence he had to obtain the introduction of his ventilators. Success crowned his efforts. In a few years his ventilators had been put not only into Newgate and the Savoy prison, but also into the Winchester Gaol, the Durham County Gaol, then the Gaols of Shrewsbury, Northampton and Maidstone. The results were remarkable. During the first four months after their introduction into Newgate, the death rate was reduced by more than fifty per cent, while in the Savoy prison the rate fell from fifty or a hundred per annum to one or two per annum. Equally gratifying were the results at the smallpox hospitals. ...here the mortality was soon reduced to two-thirds of what it had formerly been."

"The ventilator... invented by [Samuel] Sutton... was "of another construction," being designed "to draw off the foul air on board ships by means of the cook-room fire." Sutton did not fully recognize the importance of his idea, so that it would have been forgotten had it not been for Dr. Mead, who brought it to the attention of the Royal Society."

"We have... many proofs of the great force with which plants and their several branches and leaves imbibe moisture, up their capillary sap vessels: The great influence the perspiring leaves have in this work..."

"We have from the foregoing Experiments many proofs of the very great and different quantities of moisture imbibed and perspired by different kinds of Trees, and also of the influence of the several states of the air, as to warm or cold, wet or dry, have on that perspiration. We see also what stores of moisture nature has provided in the Earth against a dry season, to answer this great expence of it in the production and support of vegetables; how far the dew can contribute to this supply, and how insufficient its small quantity is towards making good the great demands of perspiration: And that plants can plentifully imbibe moisture thro' their stems and leaves as well as perspire it."

"I have here, and as occasion offered under several of the foregoing Experiments, only touched upon a few of the most obvious instances, wherein these kind of researches may possibly be of service in giving us useful hints in the culture of plants: Tho' I am very sensible, that it is from long experience chiefly that we are to expect the most certain rules of practice, yet it is withal to be remembred, that the likeliest method to enable us to make the most judicious observations, and to put us upon the most probable means of improving any art, is to get the best insight we can into the nature and properties of those things which we are desirous to cultivate and improve."

"I was at first much discouraged, when I reflected on my Rashness, in venturing on an Undertaking, which had baffled the repeated Attempts of the best Philosophers and Chymists, both Ancient and Modern: In so much that they looked upon it as almost impracticable to find out any way to procure a wholesome Drink from Sea-Water."

"About the Year 1675, William Walcot, Brother to Sir , obtained a Patent for making Sea-Water fresh: And the King, before the Grant of this Patent, had the curiosity to go and see Mr. Walcot do it, which was by distilling it in a very large Still; into the Still he put some Ingredient, which was to cure the distilled Water of any noxious Quality: But what it was, he kept a great secret. I suspect that the principal thing was only Distillation, because in all his printed Accounts of it, he purposely avoids the calling it a Still, but calls it a Machine or Engine, and Distilling he calls the working of the Machine, not Distilling."

"Johannes Gadesden [i.e.,] Johannes Anglicus, Anno 1516, says that Sea-Water may be sweetened four ways, viz. by filtrating thro' Sand: By clean Linnen laid over a Boiler, and squeesing the Moisture out, as from the Sponges: By Distillation: As alfo by thin Bowls made of white Virgin Wax, which 'tis said will free the Water from its Saltness, and from some part of its nauseous Bitter. But this is only a matter of curiosity, because but a very small Quantity can be thus prepared; and in order to make those waxen Bowls fit for farther Filtration, they must be cleansed from the Salt, by being washed in fresh Water."

"The Reverend Dr. Colbatch... who some Years since desired me to attempt, to make Sea-Water wholesome, informs me that he had good Reason to believe that the Ingredient which Mr. Walcot put into Sea-Water, in order to make it wholesome, was some Preparation of by Fire."

"In the Year 1683 Mr. Fitz-gerald, a near Relation of the Famous Robert Boyle Esq; having upon Mr. Boyle's encouragement made a Discovery of a new easy and practicable way of making salt Water fresh... Mr. Walcot asserted before the House of Commons, that Mr. Fitz-gerald's Water was rough, harsh, fiery, corroding and tormenting the Body when constantly drank of. This I suspect was the true Reason why both their Methods of preparing fresh Sea-Water were disused..."

"For this [ventilator] invention Triewald was granted a privilege for life by the King and Senate of Sweden. He then wrote a "deduction" on the usefulness of ventilators... distributed among... naval officers. This "deduction" was read before the Royal Society in 1742. In it Triewald recommends the use of ventilators "in Hospitals and Barracks for the sick, Men-of-War and Hospital Ships.""

"The methods devised by Hales and Triewald seem to have been identical, and the history of their invention is told by Hales in his book on ventilators published in 1743."

"The Hales ventilators were nothing more than ingeniously contrived bellows which sucked the foul air from the rooms or spaces to be ventilated and blew it out of doors. When large, these bellows were worked by means of a wind-mill; when small, by hand."

"[T]he Gentlemans Magazine says, "...Dr. Hales['s] ventilators came more easily into use for many purposes of the greatest importance... particularly for keeping corn sweet..." ...Duhamel du Monceau ...at the suggestion of Hales, equipped one of the [French] public granaries with a wind-mill and ventilators to draw up air through the grain. It was probably through Duhamel's influence that Hales persuaded to introduce his system of ventilating into the French prisons in which British soldiers were confined."

"Upon Inquiry from knowing Persons, I find that Norway or Swedish Tar, which is dark, thick and clear... is accounted the best for the general Uses... But that the Tar which is made of the Tops of -Trees... having lain long dead... after having either fallen... or being killed by the draining off their Sap... (These Tops are commonly called Light-wood, the poorer People making use of them instead of Candles:) This Tar being burned in a very strong Fire of such dry Wood, is of a very caustick, corroding Nature, so as to be hurtful to Ropes, &c. for which reason it is not used in the Royal Navy. But the American Tar, which is made of green Fir-Trees, with a less degree of Fire, is esteemed good, and is called green Tar..."

"And Mr. Triewald further says, that in the Summer of the Year 1742, be bad sent one of his Engines, calculated for a Sixty Gun Man of War, to France; which being approved of by the Royal Academy of Sciences at Paris, the King of France has ordered all the Men of War to be furnished with the like Ventilators."

"Having procured some Norway or Swedish Tar which was thirty Years old... I, according to the Bishop's Prescription, made Tar-water in the proportion of a Gallon of Water to a Quart of Tar, stirring it four Minutes: I then took a Pint of this Tar-water, and evaporated it away in a , cut to a wide Orifice... and weighed."

"This Treatise, he says, was read before the Royal Academy of Sweden the third day of April 1742. ...This was eleven Months after mine was laid before the Royal Society."

"And in his Letter to Baron Wasenberg, Envoy from the King of Sweden, dated the 22d of April 1743... he says, "that every Swedish Man of War, and Hospital Ship, was last Year furnished with one of my Engines; which had not been done, in case so they had not experienced the Benefit of the same, the Campaign so before that." So that a Trial was made with these Ventilators in the Year 1741, which proved a very sickly Summer in the Swedish Fleet, except only in the Ship or Ships, which were refreshed by Ventilators: A strong Instance of their great Usefulness; which induced the Swedes to put them into every Man of War and Hospital-Ship, the rear following."

"When Tar-waters of different Degrees of Strength were put into Florence Flasks, with other inverted Flasks fixed on them, and all were placed in the same Vessel of hot Water; on breaking the upper Flasks, the volatile acid Spirit could very sensibly be tasted, especially that of the stronger Tar-water; which shows that these Waters are impregnated therewith: and which when distilled from Turpentine, Dr. Boerhaave in his Chemistry says, is the best vegetable Acid that is known."

"The contributions of Hales to the "Philosophical Transactions" were numerous and dealt with a great variety of topics. ...the following [9 not shown here] may be enumerated... Whenever these papers seemed to him to be of value to the public or to deal with topics of general interest, he would publish a popularized version in the Gentleman's Magazine. But besides these abstracts this magazine contains numerous articles from his pen, of which the following [5 not shown here] are the more important..."

"November the sixth following, viz. in the Year 1741 Martin Triewald, Captain of Mechanicks and Military Architect to the King of Sweden, and Fellow of the Royal Society at London, in a Letter to M.D. and Secretary of the Royal Society, says, that "this Spring he had invented a Machine, for the Use of his Majesty's Men of War, which went to block up Petersburgh, in order to draw out the bad Air from under their Decks, the least of which does exhaust 36172 cubick Feet of Air in an Hour,"..."