So we shall have to make some provision for that, Wally.

It will be absolutely essential." "All right.

Allowing it's been made, what then ?" asked "Tiger," with extraordinary interest.
"Can't you see?
We'll have every household under our absolute thumb ?" And Flint pressed his thumb on the table to illustrate.

"My God, man, think of it! Every city honeycombed by our pipes--yes, and every village and hamlet too, and even every farm house that can afford it! At first, the cost will be very low, till people have become accustomed to ozone as they are to water.

The whole ventilation problem will be solved, at once and for all time.