The increasing interest in the matter of healthy exercise is shown by the number of athletic clubs and gymnasiums throughout the country, especially so in our colleges of learning and public institutions. Most of these have every gymnastic appliance, as also professors to give instruction; but where such do not exist a complete outfit at a very moderate expense can be obtained, all ready for use. The rowing machine has been previously described. The health lift, as a gentle exercise, is rapidly becoming an institution of necessity to persons of sedentary habits, and brings into action, when properly used, as many muscles of the human frame as any other exercise, and yet consumes but a few moments of time daily, which of itself is an important item to brain-workers and industrious humanity generally. It is so adjustable as to be alike suited for the weakest, strongest, shortest and tallest persons of either sex. Indian clubs, dumb-bells, trapeze bar and rings and striking bag may all be readily obtained, and, simpler still for in-door exercise, Goodyear’s Patent Parlor Gymnasium, which can be used by ladies and children without any fear of strain or the slightest jar to the system. Dr. Dio Lewis, in his work on New Gymnastics, gives a series of movements and illustrations without the aid of any auxiliaries, so that there can be no possible excuse for neglecting exercise. Sun and air baths, involving no expense, can always be had. By these we mean exposing the body naked a certain portion of the day to their effects. It was the custom of John Quincy Adams to walk up and down his bedroom nude, and with open windows as a preventative of colds. This he practiced both winter and summer, with the desired effect, living to be over eighty. With a view still more to the assistance and preservation of nature, General Pleasanton has written an elaborate work, claiming wonderful effects in nervous diseases from the sun’s rays as reflected through blue glass panes, and his theory is extensively practiced with very encouraging results. Dr. Samuel R. Elliott of this city, an athlete as well as a very skillful physician and scientist, has found that in some cases the blue glass alone produces too strong an effect, and believes that alternate blue and white strips, two or three inches wide, engender the proper form and quantity of electricity; and we therefore suggest that his plan be adopted. The patient should sit for an hour or more daily in such position that, whatever part of the body is affected, may be acted upon by the rays thus received. Where advice can be had it is better to obtain it, as all persons cannot even take electricity in the same manner, quantity or proportion. The glass should not be colored on the surface alone, but through and through, of a deep mazarine hue.