The new circumstances and remarkable activity which characterize our modern civilization are so different from those which surrounded the monotonous lives of our forefathers, that we have not as yet become used to them. We are, as it were, in a new world of life, to which our systems are not yet acclimated. Hence it is that the annals of me- . dicine chronicle a large increase in all varieties of nervous maladies within the last score or two of years, in both sexes and in all civilized lands.