And here I shall step aside a little from the main argument, and attempt to _explain_ the _effects_ which _temperate drinking_ has upon the animal system; and how it leads to ruinous drunkenness, BY A LAW OF OUR NATURES, certain and invariable. The nervous system, as I have said, is that department of our bodies which suffers most from stimulants and narcotics. Although the circulation of the blood is increased, and all the animal spirits roused by alcoholic drink; still, the nerves are the organs that must finally bear the brunt and evil of this undue excitement. Thus we see in the man who has been overexcited by these stimulants, a trembling hand, an infirm step, and impaired mental vigor. The _excitability_ of our system--and by this term we mean that property of our natures which distinguishes all living from dead matter--is acted upon by stimuli, either external or internal; and it is by various stimuli, applied properly, and in due proportion, that the various functions of life are kept up. Thus a proper portion of food, and drink, and heat, and exercise, serves to maintain that balance of action among all the organs, which secures health to the individual. But if an agent is applied to the system, exerting stimulant powers exceeding those that are necessary for carrying on the vital functions steadily, an excitement ensues which is always followed by a corresponding collapse. This principle is clearly illustrated by the stimulus of alcohol. If a person unaccustomed to its use receives into his stomach a given quantity of distilled spirits, it will soon produce symptoms of universal excitement. The pulse increases in frequency; the action of all the animal functions is quickened; and even the soul, partaking of the impulse of its fleshly tabernacle, is unduly aroused. But this is of short duration, and a sinking, or collapse, proportioned to the excitement, soon takes place, with a derangement, more or less, of all the organs of the body. The stimulus repeated, the same effect ensues. We must, however, notice that the same quantity of any unnatural stimulus, such as opium, spirit, etc., frequently repeated, fails to produce its specific effect. Hence, in order to secure the same effect, it is necessary to increase its quantity. Thus, to a person indulging in the frequent or stated practice of drinking, before he is aware, the repetition becomes pleasant. As the accustomed hour returns for his dram, he regularly remembers it; again and again he drinks; the desire increases; he makes himself believe it is necessary from the very fact that he desires it; the principle, or law, of which we have been speaking, developes itself; an increased quantity becomes necessary to insure a feeling of gratification; more, and still more becomes necessary, and oftener repeated, until without it he is miserable; his overexcited system is wretched, soul and body, without _the constant strain_ which the stimulus affords.