Eventually rifle and artillery fire deafen the soldier; fatigue overpowers him; he becomes inert; he hears commands no longer.

The cinchona tree, like the pimento, deteriorates under cultivation, and in moist, warm, rich valleys the bark becomes inert.

The mind bound down too closely to what is practical either becomes inert, or revenges itself by rushing into the savage wilderness of "isms."

'The brain fluid can be stored for brief periods, but once it becomes inert, the fluid is useless.