Francesco Castracane degli Antelminelli

"However great this addition to the number of facts serving to elucidate the natural history of these most interesting organisms may have been, the same cannot, unfortunately, be said regarding our knowledge of their organic development and general economy. This lamentable condition of things must be attributed to the too natural desire which observers entertain to associate their name with the discovery of a new form, to which end, consequently, the majority devote themselves. And an additional reason may be found in the difficulties which are met with in the investigation of the mode of development of organisms of such astonishing minuteness, which renders it almost a matter of chance when we are able to observe the various phases of the organic life of the Diatomacae. Whence arises the necessity of examining with the utmost attention everything that is presented in the field of the microscope, and especially in the case of living diatoms, which should be daily observed at all seasons to enable us to watch all the epochs of their development."

"The apparent function of the Diatomacae in the economy nature, viz. to vivify, as it were, the immensity of the ocean, as well as all fresh and brackish waters, decomposing, as they do, carbonic acid under the influence of light, and consequently giving off oxygen, is sufficient to show that organisms of such excessive minuteness must be endowed with an extraordinary reproductive capacity in order to supply, by their number, the vast scope of the office they are destined to fulfil."

"Castracane was a devout priest as well as an enthusiastic investigator."