The stoker works at the same time, without stopping.

Fuel, the source of energy, makes but a short stay in the system, where it is consumed and furnishes heat, whence movement is derived.

Life is a fire-box.

Warmed by its food, the animal machine moves, walks, runs, jumps, swims, flies, sets its locomotory apparatus going in a thousand manners.
To return to the young Lycosae, they grow no larger until the period of their emancipation.

I find them at the age of seven months the same as when I saw them at their birth.