work of rescue and revival is greatly needed; for it is perhaps, not excepting even music, the completest language of the emotions and can be made one of the best schools of sentiment and even will, inculcating good states of mind and exorcising bad ones as few other agencies have power to do. Right dancing can cadence the very soul, give nervous poise and control, bring harmony between basal and finer muscles, and also between feeling and intellect, body and mind. It can serve both as an awakener and a test of intelligence, predispose the heart against vice, and turn the springs of character toward virtue. That its present decadent forms, for those too devitalized to dance aright, can be demoralizing, we know in this day too well, although even questionable dances may sometimes work off vicious propensities in ways more harmless than those in which they would otherwise find vent. Its utilization for and influence on the insane would be another interesting chapter. Very interesting scientifically and suggestive practically is another correspondence which I believe to be new, between the mode of spontaneous activity in youth and that of labor in the early history of the race. One of the most marked distinctions between savage and civilized races is in the longer rhythm of work and relaxation. The former are idle and lazy for days, weeks, and perhaps months, and then put forth intense and prolonged effort in dance, hunt, warfare, migration, or construction, sometimes dispensing with sleep and manifesting remarkable endurance. As civilization and specialization advance, hours become regular. The cultured man is less desultory in all his habits, from eating and sleeping to performing social and religious duties, although he may put forth no more aggregate energy in a year than the savage. Women are schooled to regular work long before men, and the difficulty of imposing civilization upon low races is compared by Bücher[8] to that of training a eat to work when harnessed to a dog-cart. It is not dread of fatigue but of the monotony of method makes them hate labor. The effort of savages is more intense and their periods of rest more prolonged and inert. Darwin thinks all vital function bred to go in periods, as vertebrates are descended from tidal ascidian.[9] There is indeed much that suggests some other irregular rhythm more or less independent of day and night, and perhaps sexual in its nature, but not lunar, and for males. This mode of life not only preceded the industrial and commercial period of which regularity is a prime condition, but it lasted indefinitely longer than the latter has yet existed; during this early time great exertion, sometimes to the point of utter exhaustion and collapse, alternated with seasons of almost vegetative existence. We see abundant traces of this psychosis in the muscle habits of adolescents, and, I think, in student and particularly in college life, which can enforce regularity only to a limited extent.