From personal observation I am satisfied that some of the brightest minds are essentially ruined for the accomplishment of any large work in life by such a course of conduct in their education, who, under some other course of management, in which these mental tendencies could have been better understood and guided, might have been saved; and that often these are minds with the best natural endowments. How it is possible that instructors of young persons can suppose that any larger power of intellect, or any greater capacity for usefulness in after-life, can possibly be secured by such treatment, or rather by such abuse of the organ of the mind, or why they have not been more careful to instruct those under their care as to this most important of all subjects to them in their future work, it is not easy to imagine, and can only be accounted for by the supposition that they have not studied the subject carefully enough in its physiological relations. It should always be borne in mind that excessive use or stimulation of any part or organ of the system can in no sense be considered as education of it, but as a sin against its nature, which will be sure to require retribution. It may be made to accomplish more in a given time, but it must be at a discount on its future activity; there must come a reaction, that is, a condition in which there will be performed less of function than before; and that such a course of treatment has a tendency to produce a condition of _instability_, and more or less of _uncertainty of action_. Within the last twenty years there appears to have come, in some measure, a reaction in reference to exclusive attention to brain discipline, and in favor of more attention to physical exercise during the college curriculum. There have been organized in most of the colleges and academies, boating clubs, base-ball clubs, and other associations with the avowed object of securing a higher state of physical development and education. This has been a step in the right direction, and none too soon have we come to realize the fact that the brain depends very largely upon the health of the body for its exercise of the best thought. The importance of a physical education will be more fully referred to hereafter, but at this stage of the subject it is pertinent to suggest that violent use of the muscles for short periods is generally not the best mode of exercise; that the sudden expenditure of so much nervous force in training and in contests, as is necessary in order to secure the highest attainable power in rapidity, skill, and strength of stroke, during a half or one hour; or to attain the highest skill in throwing a ball, or in receiving it in hand, or in many other of the manoeuvres of base-ball playing, which require such quick changes of position, and violent motion of the body, is in great danger of ultimately defeating the very object for which they are ostensibly practised.