2ndly—The position of a beast in water is a natural one.
Q. Why is it more difficult for a man to swim than for a beast?
A. Because the head and limbs of a man (like those of a beast) are heavier than water, and these compose more than half his body:
2ndly—The position of a man in water is unnatural to him.
Q. Why can fat men swim more easily than spare men?
A. Fat is lighter than water; and the fatter a man is, the more buoyant will he be.
Q. How are fishes able to ascend to the surface of water?
A. Fishes have an air-bladder near their abdomen: when this bladder is filled with air, the fish increases in size; and (being lighter) ascends through the water to its surface.
Q. How are fishes able to dive in a minute to the bottom of a stream?