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Updated: May 22, 2025
Certain unknown natural forces, however, might have made no more of us than of non-mammalian and less highly organized creatures. "Don't bother your head about these problems yet a while. On my word, we've got enough to do for the present without much caring about how or why. "All we definitely know is that some very long, undetermined period of time has passed, leaving us still alive.
However, we need not depend upon non-mammalian evidence for either the secretory explanation or the dual basis. An ideal case would be to observe the effects of circulating the blood of one sex in a developing embryo of the other. This blood-transfusion occurs in nature in the "Free-Martin" cattle.
Neither, perhaps, need we mourn greatly that the exact branch by which our reptilian or amphibian non-mammalian ancestor became the first and most primitive of mammals is still hidden in unexplored recesses of early strata. The most patrician monarch of to-day would not be greatly disturbed as to just who were his ancestors of the days of the cave-dweller.
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