waiting for what I thought was likely to happen. Both my host and my hostess declared that they had never enjoyed a summer evening meal more, and yet all that was ordered was not consumed, while the cost, for the three, was less than a dollar for the food alone. The method employed to interpret appetite was a revelation to my friends. They were accustomed to ordering several courses for each person, although they thought they were "small eaters" and economic feeders. Had they ordered for us three without my assistance, the dinner would not have cost less than four or five dollars, and with a plethora of food on the table all would have felt it necessary to eat as much as possible, in order to get value received. The above, as related, was an actual happening, but it in no way indicates what another _trio_ would have ordered in response to their appetites. That is immaterial. The principle of consulting the leanings of appetite is the thing of first importance, and giving appetite a chance to naturally discriminate is the second natural requirement. Had the weather been cooler, and had the appetite earned been like that of a labouring man, more food and more variety might have been required to satisfy appetite, and hence the needs of the body. In that case, after plying the appetite to repletion on the first dish ordered, a second or a third could easily have been added. With this principle of learning the real demands of appetite, any number of combinations can be had for variety. In summer, with light physical exercise, very little proteid-bearing food is needed; but in winter, with vigorous exercise or hard physical labour, the appetite will crave foods that have proteid and fat whether one knows what proteid is or the difference between carbohydrate elements and fat. Any empirical idea of the possible elemental requirements is likely to lead to false suggestion and do harm. It is difficult to stand by and let Nature do the ordering if there is too much elemental intelligence, and that is where the animals, when allowed free choice of food, get on better with their nutrition than man himself, and man's only protection is to carefully heed the delicate discrimination of appetite. This is not a difficult thing to do, for appetite can be easily satisfied within a small range of simple foods. With any desired variety of sumptuous food to choose from, and no restraint from any cause whatever, the author fed himself nine-tenths of the time during the examination at Yale University, in cold winter weather, on griddle cakes well buttered and accompanied with an abundance of maple syrup. Occasionally more proteid would be demanded,--say once a week, or once in five days,--and then baked beans was the preferential choice.