I have in mind at this writing cases which will illustrate my point. One was that of a young lady of ordinary mental endowments, whose parents usually brought her to me for advice as often as every two or three weeks, because she was nervous, and suffered from frequent and protracted headaches. Inquiry elicited the fact that she was obliged to study during the evening until ten or eleven o'clock to accomplish the tasks which were assigned to her class. It was thought by the parents that this practice was all right, that it evinced faithfulness and ambition, and it was with much difficulty that I could convince either her or her parents that her ill-health was due to the constant violation of the laws of health; that her brain and whole nervous system required longer periods of repose and quiet at her age than it would be likely to need later; that the future of her whole life as a member of society might, and must, in a large degree, depend, not on the grade of the marks she might receive in her daily recitations, but largely on the nervous and physical strength she might be able to build up before she should become twenty-one years of age. This young lady was of a healthy parentage, and inherited a good physique, and with proper habits of life and study would have had excellent health. As it is, her system will not for years, if ever, recover from the effects of her habits of excessive hours of study. The name of another patient occurs to me: a young man of good parentage, and apparently inheriting a good constitution. He was ambitious in study, and his parents permitted him to do all he might choose to. He entered college at sixteen, standing among the best scholars of his class, but before the end of the first year, began to be troubled with noises in his head and confusion of mind. He was removed from college, and remained out till the end of the year, but partially kept up his studies at home. He entered the sophomore class but was obliged to leave earlier in the course than before. He tried the junior year with a like result, and from this time exhibited more pronounced indications of mental impairment. He travelled both in this country and in Europe; he consulted some of the most eminent physicians, but all to no purpose; the mischief had been too effectually accomplished. The delicate tissues of the brain had been over-strained, and so impaired that when his parents awoke to the gravity of his condition, it was too late to repair the mischief. I have under my care at the present time a young girl, thirteen years of age, who has come to me from one of the seminaries for girls in New England. She informs me that the pupils in that institution are required to spend eight or more hours a day in study and recitation, and some portion more of every day in household work, and that _she_ was permitted to study and recite some ten hours a day, as she was behind her class in some of the studies when she entered.