It ought not to be requisite to insist upon good health as a condition precedent for any one aspiring to be a librarian. So very much depends upon this, that it should form a part of the conscientious duty of every one to acquire and maintain a sound condition of physical health, as a most important adjunct of a thoroughly sound and healthy condition of the mind. This is easier than most persons are aware. If we except inherited constitutional weaknesses, or maladies of a serious character, there is almost no one who is not able by proper diet, regimen, and daily exercise, to maintain a degree of health which will enable him to use his brain to its full working capacity. It demands an intelligent and watchful care of the daily regimen, so that only simple and wholesome food and drink may be taken into the system, and what is equally important, adequate sleep, and habitual moderate exercise. No one can maintain perfect health without breathing good unadulterated air, and exercising in it with great frequency. One's walks to and from the library may be sufficient to give this, and it is well to have the motive of such a walk, since exercise taken for the mere purpose of it is of far less value. The habit of taking drugs, or going to a doctor for every little malady, is most pernicious. Every one, and especially a librarian, who is supposed (however erroneously) to know everything, should know more of his own constitution than any physician. With a few judicious experiments in daily regimen, and a little abstinence now and then, he can subdue head-aches, catarrhs and digestive troubles, and by exercising an intelligent will, can generally prevent their recurrence. If one finds himself in the morning in a state of languor and lassitude, be sure he has abused some physical function, and apply a remedy. An invalid will make a poorly equipped librarian. How can a dyspeptic who dwells in the darkness of a disease, be a guiding light to the multitudes who beset him every hour? There are few callings demanding as much mental and physical soundness and alertness as the care of a public library.