And when we consider that the principal object of all physical training is an elastic, vigorous condition of the nervous system, the superiority of light gymnastics becomes still more obvious. The nervous system is the fundamental fact of our earthly life. All other parts of the organism exist and work for it. It controls all, and is the seat of pain and pleasure. The impressions upon the stomach, for example, resulting in a better or worse digestion, must be made through the nerves. This supreme control of the nervous system is forcibly illustrated in the change made by joyful or sad tidings. The overdue ship is believed to have gone down with her valuable, uninsured cargo. Her owner paces the wharf, sallow and wan,--appetite and digestion gone. She heaves in sight! She lies at the wharf! The happy man goes aboard, hears all is safe, and, taking the officers to a hotel, devours with them a dozen monstrous compounds, with the keenest appetite, and without a subsequent pang. I am confident that the loyal people of this country have eaten and digested, since Roanoke and Donelson, as they had not before since Sumter. Could we have an unbroken succession of good news, we should all have good digestion without a gymnasium. But in a world of vexation and disappointment, we are driven to the necessity of studied and unusual muscle-culture, and other hygienic expedients, to give the nervous system that support and vitality which our fitful surroundings deny. If we would make our muscle-training contributive in the highest degree to the healthful elasticity of our nerves, the exercises must be such as will bring into varied combinations and play all our muscles and nerves. Those exercises which require great accuracy, skill, and dash are just those which secure this happy and complete intermarriage of nerve and muscle. If any one doubts that boxing and small-sword will do more to give elasticity and tone to the nervous system than lifting kegs of nails, then I will give him over to the heavy-lifters. Another point I take the liberty to urge. Without _accuracy_ in the performance of the feats, the interest must be transient. This principle is strikingly exemplified in military training. Those who have studied our infantry drill have been struck with its simplicity, and have wondered that men could go through with its details every day for years without disgust. If the drill-master permit carelessness, then, authority alone can force the men through the evolutions; but if he insist on the greatest precision, they return to their task every morning, for twenty years, with fresh and increasing interest. What precision, permit me to ask, is possible in "putting up" a heavy dumb-bell? But in the new dumb-bell exercises there is opportunity and necessity for all the accuracy and skill which are found in the most elaborate military drills.