should not be too great a deprivation of water is, that this loss is so keenly felt as to almost cause suffering,—certainly irritation,—and so disturbs the tranquillity and perfect working of the nervous system as to destroy that balance which is so necessary.
On this point, a word about sleep. The brain must have its exercise and its rest as well as the muscles. It must be nourished. Foods containing phosphorus (as fish) should be used. During the intervals between muscular exercise it should be kept moderately employed, and not too much stimulated. Reading, chat, discussions not too exciting, and games not calculated to arouse too great an excitement (that is, chess—not poker). The man should have plenty of sleep. While some men can go without much sleep, the average man, and especially the man in training, should have eight hours.
In the nervous system is the motive-power of the machine; and in so far as that is exhausted, or impaired, or neglected by exclusive attention to the other systems, in so far will the machine fail to work.
As to alcohol and tobacco: it may safely be said that, on general principles, they are both artificial demands, unnecessary, and therefore not beneficial. As, however, in these days, a large proportion of men are habituated to their use, and the system has become, in a measure, dependent upon them for the performance of certain functions, that the immediate and entire abandonment of their use is not to be advised. The amount of alcohol should be very much restricted,—only what would be contained in a pint of malt liquor, at the most, and that at meal-time, should be taken. Tobacco should, also, be restricted, and gradually diminished till none at all Is used. The heart, which has been long accustomed to be whipped up by alcohol, and soothed down (though irritated) by tobacco, will not work so well till it has been gradually accustomed to other treatment.
As all the digestive functions should be performed properly, and as the diminution of water supply is likely to be considerable, certain vegetables, like spinach and onions, and certain