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A steam-engine and a steel-filing might equally well be compared together. Professor Delpino makes a further objection which, however, will only be of weight in the eyes of Vitalists.
This infinite field now open before him, Darwin began his investigations, and the whole world knows his triumphs. He has been followed by a host of disciples, to whom his books have come as an inspiration and ennobling impulse. Hildebrand, Delpino, Axell, Lubbock, and, latest and perhaps most conspicuous, Hermann Müller, to whom the American reader is especially referred.
Darwin has published a short notice in reply to Professor Delpino, in Scientific Opinion of October 20, 1869, p. 426. In this reply he admits the justice of Professor Delpino's attack, but objects to the alleged necessity of the first subordinate hypothesis, namely, that the emission of gemmules takes place in all states of the cell.
Yet it is not at all so, and this fact seems to amount almost to an experimental demonstration that the hypothesis of pangenesis is an insufficient explanation of individual evolution. Two exceedingly good criticisms of Mr. Darwin's hypothesis have appeared. One of these is by Mr. G. H. Lewes, the other by Professor Delpino of Florence.
As to formations without the requisite gemmules. Mr. Lewes and Professor Delpino. Difficulty as to developmental force of gemmules. As to their spontaneous fission. Pangenesis and Vitalism. Paradoxical reality. Pangenesis scarcely superior to anterior hypotheses. Buffon. Owen. Herbert Spencer. "Gemmules" as mysterious as "physiological units." Conclusion.
This seems a strong confirmation of what has been here advanced. The main objection raised against Mr. Professor Delpino considers that as many as eight of these subordinate hypotheses are required, namely, that The emission of the gemmules takes place, or may take place in all states of the cell. The quantity of gemmules emitted from every cell is very great.
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