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Updated: May 21, 2025
We have seen, in studying the evolution of the body as a whole, that phylogeny casts a light over the darker paths of ontogeny, and that we should be almost unable to find our way in it without the aid of the former. We shall have the same experience in the study of the organs in detail, and I shall be compelled to give simultaneously their ontogenetic and phylogenetic origin.
The presence of that element produces in the individual an associative recall of the adaptation of his species that is, the brain pattern developed by his phylogeny becomes energized to make a specific response. The intensity of the response depends upon the state of threshold that is, upon the associative recall of the individual's own experience his ontogeny.
What, however, may be said is that the difficulties presented by what is called phylogeny that is, the relationships of different classes to one another are so great as to have led more than one man of science to proclaim his belief that evolution has been poly and not mono phyletic.
All geologists are now agreed that we can demonstrate a definite historical succession in the strata, and that the lowest of them were deposited in very remote, and the uppermost in comparatively recent, times. However, there is no part of the earth where we find the series of strata in its entirety, or even approximately complete. We must act in this way in constructing the phylogeny of man.
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