"And we know what Helmholtz, the highest authority in Europe on the subject, has said about the human eye; that if an …"

"The formation of scales and of the web of harmony is a product of artistic invention, and is in no way given by the n…"

"As you are aware, no perceptions obtained by the senses are merely sensations impressed on our nervous systems. A pec…"

"Now it is a universal law of the perceptions obtained through the senses that we pay only so much attention to the se…"

"Every great deed of which history tells us, every mighty passion which art can represent, every picture of manners, o…"

"There is a kind, I might almost say, of artistic satisfaction, when we are able to survey the enormous wealth of Natu…"

"The last decades of scientific development have led us to the recognition of a new universal law of all natural pheno…"

"The quantity of force which can be brought into action in the whole of Nature is unchangeable, and can neither be inc…"

"In speaking of the work of machines and of natural forces we must, of course, in this comparison eliminate anything i…"

"The external work of man is of the most varied kind as regards the force or ease, the form and rapidity, of the motio…"