From what has preceded, it follows that he who breathes much and perspires much when at work, must eat much fat-producing food, and besides add a little ready-made fat; while he who breathes and perspires little, needs but little of that kind of food. This accounts for the circumstance that in winter, when the air is denser, and therefore one inhales more oxygen and thus uses more fat for exhalation, we must eat more fat food; while in summer every one takes less of it. We know that in cold countries food is taken which, on account of its containing great quantities of fat, would in hot climates produce sickness. A hearty worker perspires much at his labor, and, in consequence of his increased activity, breathes more than the quiet and sedentary; he must therefore eat with his breakfast some fat--bacon, etc.--because this enables him to prevent his flesh and blood from decreasing. His body will be strong and powerful, and he will at all times be able to earn with his arm more than his stomach costs him. But let no one believe, therefore, that fat alone is a means of food, and, above all, beware of the mistake that ready-made fat is healthier to eat than fat-producing articles. Fine experiments have been made about the feeding of animals with fat. The results have shown that fat taken alone is injurious, and goes off again without having been of any use to the body; while, on the other hand, fat-producing food greatly assists the fattening of animals. He who has seen how geese are fattened, will have a correct idea about the process of the formation of fat in the human body. A handful of dough is forced into the mouth and gullet of the goose; during the time of her fattening she is shut up in so close a space that she can neither rise nor walk about. The poor creature is thus deprived of evaporation by perspiration; the process of breathing is rendered very difficult; and, because she breathes and perspires little, her fat does not change into carbonic acid and water, but collects in the body in an unusual manner, until finally the creature is relieved from her pains by being killed. We see that her fat is nothing else than the transformed starch of the dough, which remained in the body without being used. If we should try, however, to feed a goose on pure fat only, she would not fatten at all, but fall sick. Pure fat must only be taken together with fat-producing food. The cause of this is, that only a part of the intestines secretes a juice which can dissolve fat; while the gastric juice in the stomach does not dissolve the fat at all, but allows it to float on the surface, as fat does in water. Our readers will now find it natural that a workman who perspires and breathes much, should by all means take but little bacon for breakfast; and this he must eat only on those days when he has much work before him; and then he must not eat it without bread. CHAPTER VII. LIQUOR. Is it advisable to take a "drink" before breakfast?