Smoke loaded with carbonic acid and watery vapor.
6.

Incombustible ashes.
7.

Motive force of simple alternate push and pull in the piston, which, acting through wheels, bands, and levers, does work of endless variety.
8.

A deficiency of fuel, water, or air, disturbs, then stops the motion.
_The Animal Body in Life takes_: 1.

Food: vegetables and flesh, both combustible.
2.