The most common form of nervous manifestations is such as would lead one to think of exhaustion of the forces usually attributed to the structures of the cord: the nervous energies are very much depleted. They seem, at times, to be duly supplied, but the forces may as quickly depart and leave the system languid and depressed, without power to coordinate the muscles. This more especially applies to a certain class of cases which assimilate organic trouble in the nervous structure. No change observable takes place in the circulation, yet it must stand to reason that the replenishing power of the nerve-matter is deficient. This must be impaired nutrition, and a lower order of nerve-structure organized, not capable of evolving so perfect a function or force――nervous energy. This suspension of nervous energies is only transitory when a fair degree of activity is established. This would seem to be caused by depriving the nerve-tissues of elements demanded to supply natural waste; which is, in all probability, the true nature of this exhaustion. We have neither spermatorrhœa nor impotency, in the strict sense of these terms. They perform the sexual function well, but lack power to repeat the act as often as healthy people are wont to do. Sometimes they cannot control their ejaculation during various conditions of excitement, fear, or fright. It is in this condition that a lack of confidence in the sexual ability is had at certain times when copulation would be the most desired. It is in such cases that a young man complains of chagrin and embarrassment. Many a time have young men described their afflictions in the language more forcible than elegant, describing such opportunities with voluptuous “sylphs,” saying, “he went back on me.” This is a weakness of the genital organ, having lost its innate power to become erect, in which all the powers of mind and will, concentrated upon the act, are required to establish the erect posture. Whenever any great mental effort is required to procure an erection, either there is local weakness, or there has been too often repeated sexual contact, which has not been followed by proper rest; or the female has not a fascinating influence over the male. The general weakness, so much the cause of alarm in young men, and yet not of the least danger, is the typical case of neurasthenia. The young man consults a doctor, with a long discourse of his symptoms: he has read a book on indiscretions of youth; feels badly; has had erotic dreams once a month; is “nervous,” feels languid, and apprehends danger. Medical students, when listening to lectures graphically picturing disease of the genital organs from sexual debauch, all have each and every form, with the rare and peculiar sequelæ. They consult the professor in whom they repose the most confidence, only to receive the assurance that nothing is the matter, only a little weakness which will soon of itself subside.