They say this, not at all suspecting that thousands of years ago that same law of necessity which with such ardor they are now trying to prove by physiology and comparative zoology was not merely acknowledged by all the religions and all the thinkers, but has never been denied.
…a handful of earth at a certain period of time (in the first case the unknown quantity is the time, in the second case it is the origin); and the question of how man’s consciousness of freedom is to be reconciled with the law of necessity to which he is subject cannot be solved by comparative physiology and zoology, for in a frog, a rabbit, or an ape, we can observe only the muscular nervous activity, but in man we observe consciousness as well as the muscular and nervous activity.
There are no more uses of "physiology" in the book.
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Individual physiology plays a major role in weight gain.
a professor of exercise physiology at the University