Who does not know among his friends business men whose faces show that they are nearly all the time overworked; who get thin, and stay so; who look tired, and are so; who go on dragging along through their duties--for they are men made of the stuff which does the duty as it comes up, whether hard or easy? The noon meal is rushed through, perhaps when the brain is at white-heat. More is eaten, both then and in the evening, than will digest; and good as is the after or the before dinner ride, as far as it goes, it does not go far enough to make the digestion sure. Then comes broken sleep. The man waking from it is not rested, is not rebuilt and strong, and ready for the new day. With many men of this kind--and all city men know they are well-nigh innumerable--what wonder is it that nervous exhaustion is so frequent among them, and that physicians who make this disorder a specialty often have all that they can do? One of the most noted of them, Dr. S. Weir Mitchell, of Philadelphia, in his valuable little book, "Wear and Tear; or, Hints for the Overworked," page 46, says: "All classes of men who use the brain severely, and who have also--and this is important--seasons of excessive anxiety or grave responsibility, are subject to the same form of disease; and this is why, I presume, that I, as well as others who are accustomed to encounter nervous disorders, have met with numerous instances of nervous exhaustion among merchants and manufacturers. "My note-books seem to show that manufacturers and certain classes of railway officials are the most liable to suffer from neural exhaustion. Next to these come merchants in general, brokers, etc.; then, less frequently, clergymen; still less often, lawyers; and, more rarely, doctors; while distressing cases are apt to occur among the over-schooled young of both sexes." And while the more active among business men run into this sort of danger, those less exposed to it still do little or nothing to give themselves sound, vigorous bodies, so as to gain consequent energy and health, and so they go through life far less efficient and useful men than they might have been. Hence their sons have to suffer. The boy certainly cannot inherit from the father more vigor and stamina than the latter has, however favored the mother may have been; so, unless the boy has some sort of training which builds him up, his father's weaknesses or physical defects are very likely to show in the son.