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With the setting of the sun a thick mist arose--one of those humid tropical mists that are responsible for malaria and other zymotic diseases peculiar to the Torrid Zone.

As in other zymotic diseases, the mortality from relapsing fever is highest during the early period of an epidemic, and the type of the disease grows milder as the epidemic declines.

Just as the study of hysteria deals mainly with instabilities in the threshold of consciousness, so does the study of zymotic disease deal mainly with instabilities in the constitution of the blood.

The rodents get acclimatised, unless it be that instinct impels them to take some sort of vegetable or other preventive of zymotic and mephitic diseases.

Acute inflammatory conditions may be secondary to zymotic diseases such as diphtheria, pyaemia, typhus fever and others.