If you have a grandmother, or ever had one, you know what grandmothers tell you about "hot nourishing food"; but I have tried the experiment, and satisfied myself that there is absolutely no difference in nourishing qualities between hot food and cold food. If you chew your food sufficiently, it will all be ninety-eight and six-tenths degree food when it gets to your stomach, and that is the way your stomach wants it. Of course, if you have been out in a blizzard, and are chilled, and want to restore the body temperature, a hot drink will be one of the quickest ways, and if the emergency is extreme, you may even add a stimulant. On the other hand, if you are suffering from heat, it is sensible to cool your body by a cold drink. But you should use as much judgment with yourself as you would with a horse, which you do not permit to drink a lot of cold water when he is heated up, and is going into his stall to stand still. I have mentioned the word "stimulants," and this opens a large subject. There are drugs which affect the body in two different ways: some excite the nerves, and through the nerves the heart and blood-stream, to more intense activity; others have the effect of deadening the nerves, and dulling the sense of exhaustion and pain. One of these groups is called stimulants, and the other is called narcotics; but as a matter of fact the stimulants are really narcotics, because they operate by dulling the nerves whose function it is to prevent the over-accumulation of fatigue poisons; in other words, they keep the nerves and muscles from knowing that they are tired, and so they go on working. It is possible, of course, to conceive of an emergency in which that is necessary. Once upon a time, on a hunting trip, I had been traveling all day, and was caught in a rain storm, and exhausted and chilled to the bone; I had to make camp without a fire, so when I got the tent up I wrapped myself in blankets and drank a couple of tablespoons full of whiskey. That is the only time I have ever taken whiskey in my life, and it warmed me almost instantly, and did me no harm. In the same way there were two or three occasions when I was on the verge of a nervous breakdown, and could not sleep, and let the doctor give me a sleeping powder. But in each case I knew that I was fooling with a dangerous habit, and I did no more fooling than necessary. No one should make use of either stimulants or narcotics except in extreme emergency, and never but a few times in a lifetime. What you should do is to change your habits so that you will not need to over-strain.