IN the first part of this work I have dwelt on the errors in our mode of treating Neurasthenia, consequent on the wide ignorance of the subject which still prevails; in the second part, I have drawn attention to the principal causes of the malady. The allegory forming the Introduction to Part I. gives a brief history of nervous exhaustion and the modes of treatment which have at various times been thought suitable to this most painful and trying disease. A friend, to whom I read the Introduction, criticised the quotation with which I have concluded it. She objected that I thereby gave too high a place to mere knowledge. I replied that I referred to the highest kind of knowledge. This argument, however, fails to satisfy those who persistently remind one of Eve's transgression. In my humble opinion, the point of that great and instructive history has always been missed. Adam and Eve were cast out of Eden for eating of the tree of knowledge, but if they had not been cast out of Eden, how could they have been received into heaven? It was necessary to eat of the tree of knowledge in order to desire to eat of the tree of life.