In Nature an extremely important part is played by minute
organisms. Some of them take up their abode in the human
body and there set up diseases of which consumption is the
chief. The tubercle bacillus is the sole cause of consumption:
its entrance may be prevented, mainly by destroying the
spittle of patients. Susceptibility to consumption may be
inherited: the disease itself is not. Any cause which lowers
vitality increases susceptibility. Dust is a source of danger
both out-of-doors and in. Dust in houses should be removed,
not simply stirred up. Encouragement for sufferers in early
stages of disease. 63