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act of thinking [page torn]

is produced in the nerves which are habitually used can hardly be doubted, for otherwise it is impossible to understand how the inherited tendency to certain acquired movements , as the inherited [illeg] of the senses. We see this in the inherited tendency  can be inherited. That they are inherited   we see in certain paces of the horses, which are not natural to them as contrary &
in horses to canter or amble, which are not natural
paces, ambling — of in the pointing of young pointers to point & setters to set,  & the setting of setters   in the highly peculiar flight manner of flight of certain breeds of the pigeons &c.—  —all of which are highly complex [illeg] movements.  We have similar analogous cases, as will presently be alluded to  in mankind in the inherited tricks or unusual gestures in mankind being inherited, as  will presently be alluded to.

One of the most  To those who admit the principle of gradual evolution, a most    striking instance of an the perfection with which [illeg] the [illeg] [illeg] performance of a the most difficult consensual  consensual movements may can be transmitted, is afforded  to those who admit the principle of evolution  by the humming-bird Sphinx-moth (Macroglossa); for this     insect, with the peculiar bloom in its apearance showing that it has just emerged from its coccoon      moth, shortly after its emergence from the cocoon, as shown by the peculiar bloom on its unruffled scales,    may be seen poised stationary in the air, with its long hair-like proboscis uncurled &  

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[mathematical notes by George Darwin]