Now, as a matter of fact, we cannot prove that a single species has changed. These are the words of Darwin himself, quoted from _"Life and Letters,"_ Vol. III, p. 25: "There are two or three million of species on earth, sufficient field, one might think, for observation. But it must be said to-day that in spite of all the efforts of trained observers, not one change of a species into another is on record." Dr. N. S. Shaler, Professor of Geology in Harvard, asserts that "it has not been proved that a single species has been established solely or even mainly by the operation of Natural Selection." Professor Fleischmann, of Erlangen, has gone so far as to say that "the Darwinian theory of descent has, in the realms of nature, not a single fact to confirm it." Dr. Ethridge of the British Museum says: "In all this great museum there is not a particle of evidence of transmutation of species. Nine-tenths of the talk of evolutionists is sheer nonsense, not founded on observation and wholly unsupported by facts." Prof. Owen declares that "no instance of change of one species into another has ever been recorded by man." Dr. Martin, Sanitaetsrat, of Germany, who has conducted some highly technical experiments in the blood reactions of various animals and man, on which he bases his conclusions, says: "Since Darwin we have been accustomed to consider the concept 'species' as something insecure and unstable. The whole organic world must be thought of as fluid if the evolution theory is to find room for action. It required, indeed, all the great investigator's keenness to fence his theory against the difficulty which the lack of transitional forms occasioned, and against the fact that the rise of a new species has never been observed, much more against the fact that all processes in artificial breeding have not sufficed to fix permanently the changes which have been attained. We admire the clever structure of the theory, but there is no doubt that the obstinacy with which the organism clings to its species-characteristics is the point on which it is mortal. One is, [tr. note: sic] in fact, as much justified in speaking of a struggle to retain these characteristics as to speak of a struggle for existence."