of the horse and the ox.

But apparently we have only begun using animal life. We must run
the whole gamut of the marvels of creation before conquering
conditions on this earth. ----

We used to train the biggest dogs to kill wolves. The Government
of the United States is now breeding darning-needles to kill
mosquitoes.

A certain kind of wasp, with a black and white striped body,
spends his time killing house-flies, and this creature could be
bred and used to destroy the disease-spreading pests.

Even the invisible insect life can be made most useful to man and
to his health.

The latest plan for disposing of city sewage involves the
cultivation of microbes, to be employed as disinfectors.

Several towns in Illinois and in Wisconsin have established
plants for the purification of sewage by means of microbe life.
The collections of organisms invisible to the naked eye are to be
kept in great antiseptic tanks, and employed in the purification
of the city 's refuse.

Mosquitoes will ultimately be destroyed, undoubtedly, by breeding
among them smaller creatures fatal to their existence.

Man, in his conquest and use of animal life, will run the gamut,