All this change in our manner of existence implies that we have experienced some very profound impression, which will sooner or later betray itself in permanent effects on the minds and bodies of many among us. We cannot forget Corvisart's observation of the frequency with which diseases of the heart were noticed as the consequence of the terrible emotions produced by the scenes of the great French Revolution. Laennec tells the story of a convent, of which he was the medical director, where all the nuns were subjected to the severest penances and schooled in the most painful doctrines. They all became consumptive soon after their entrance, so that, in the course of his ten years' attendance, all the inmates died out two or three times, and were replaced by new ones. He does not hesitate to attribute the disease from which they suffered to those depressing moral influences to which they were subjected.
So far we have noticed little more than disturbances of the nervous system as a con