S. To furnish food for man. Fishes.
L. And the air?
S. To furnish sustenance for man. Birds and breath.
L. How many men are there?
S. Fifteen hundred millions.
L. (Referring to notes.) Take your pencil and set down some statistics. In a healthy man's lower intestine 28,000,000 microbes are born daily and die daily. In the rest of a man's body 122,000,000 microbes are born daily and die daily. The two sums aggregate-what?
S. About 150,000,000.
L. In ten days the aggregate reaches what?
S. Fifteen hundred millions.
L. It is for one person. What would it be for the whole human population?