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Updated: May 23, 2025
A precise and clear statement of this important part of Eimer's theory of Descent, is contained in the following extracts: "The transformation of organisms is primarily conditioned by the action of immediate external influences on the organisms.
" * The organic growth of butterflies is primarily conditioned by climatic influences. * The proof is to be found in the facts revealed by the geographical distribution of butterflies, by the variations corresponding to the seasons, and by experiments regarding the influence of artificial heat and cold on development." Experimental proof is naturally of vital importance for Eimer's theory.
Such, indeed, seems to be Eimer's own meaning when he speaks of the "kaleidoscopic" character of the variation, or when he says that the variation of organized matter works in a definite way, just as inorganic matter crystallizes in definite directions. And it may be granted, perhaps, that the process is a merely physical and chemical one in the case of the color-changes of the skin.
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