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194 Professor L. Manouvrier, have even mentioned the idea as a possible explanation of the peculiarities presented by the Java skeleton. The opinions of these two gentlemen are all the more valuable, inasmuch as it does not appear that either of them derived their inspiration from anything previously written on the subject.

Dr Keith (Science Progress, vol. iii., July 1895, p. 368) thus writes :—

This, though short, is perfectly explicit in support of the principle of my contention. Professor Manouvrier discusses the question at much greater length, and several passages could be quoted from his writings, but perhaps the following will be sufficient for our purpose :—

Dr Dubois, also, in his article to the Royal Dublin Society, particularises and adopts these views in the following manner :—

"Manouvrier and Dr Arthur Keith point out that the human form of the Trinil femur is not sufficient to prove that it did not belong to the same individual as the skull-cap ; for, the phylogenetic evolution of the human femur ought to have preceded that of the skull, as the erect attitude and the erect locomotion have been the cause of the intellectual perfection. Suppose a species of Anthropoid Ape whose frame rather resembles the human suppose a large Hylobates should strive to perfect the pedal locomotion, which this