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MATTER AND FORCE. 91

motion produced in the act of union may be turned to
mechanical account. Passing from dead matter to living
matter, we find that the source of motive power here re-
ferred to is also the source of muscular power. A horse
can perform work, and so can a man, but this work is at
bottom the molecular work of the elements of the food and
the oxygen of the air. We inhale this Vital gas, and bring
it into sufficiently close proximity with the carbon and the
hydi'ogen of the fOOd. They unite in obedience to their
mutual attractions, and their motion toward each other,
properly turned to account by the wonderful mechanism of
the body, becomes muscular motion.

One fundamental thought pervades all these statements:
there is one-tap root from which they all spring. This is
the ancient maxim that out of nothing nothing comes ; that
neither in the organic world nor in the inorganic is power
produced without the expenditure of other power; that
withegigmthe..p1ant\n0,r.-..in... the animal .iS. there ,a. .creationmof
floggemor motion. Trees grow, and so do men and horses;
and here we have new power incessantly introduced upon
the earth. But its source, as I have already stated, is the
sun. For he it is who separates the carbon from the oxy-
gen of the carbonic acid, and thus enables them to recom-
bine. Whether they recombine in the furnace of the
steam-engine or in the animal body, the origin of the power
they produce is the same. In this sense we are all “ souls
of fire and children of the sun.” But, as remarked by
Helmholtz, we must be content to share our celestial
pedigree with the meanest living things. The frog, and
the toad, and those terrible creatures, the monkey and
the gorilla, draw their power from the same source as
man.

Some estimable persons, here present, very possibly
shrink from accepting these statements; they may be
frightened by their apparent tendency toward what is called

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