Hence, as a constitution modified by vaccination is not made more able to resist perturbing influences in general, it must be made less able. Heat and cold and wet and atmospheric changes tend ever to disturb the balance, as do also various foods, excessive exertion, mental strain. We have no means of measuring alterations in resisting power. There are, however, evidences of a general relative debility. Measles is a severer disease than it used to be, and deaths from it are very numerous.
Influenza yields proof.
There are other significant facts. It is a familiar biological truth that the organs of sense and the teeth arise out of the dermal layer of the embryo. The like holds of constitutional abnormalities caused by disease. Syphilis in its earlier stages is a skin disease. When once you interfere with the order of nature, there is no knowing where the results will end.