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Enthetic causation—viz. that of all contagious, endemic, and epidemic diseases.

Two important factors, especially, must be kept in view in comparing the causation of diseases in colder and warmer countries—namely, the difference in the articles of food partaken of in each, and the external sources of enthetic disorders; e.g. endemic and epidemic fevers, etc.

That such organisms are the essential and direct causes of enthetic maladies by invading the human and other living bodies as parasites, consuming and disorganizing their tissues, blood corpuscles,20 etc.

Particularly near the beginning of an attack of enthetic disease, such as scarlet fever, small-pox, typhus or typhoid fever, the physician should beware of too confidently forecasting the progress of the case for better or for worse.

The discussion of this subject will occur on a later page as a part of the general topic of the causation of enthetic diseases.