That I am not pushing too far this idea of the indicative value of gain of weight may be further seen in persons who suffer from some incurable chronic malady, but who are in other respects well. The relief from their disease, even if temporary, is apt to be signalled by abrupt gain in weight. A remarkable illustration is to be found in those who suffer periodically from severe pain. Cessation of these attacks for a time is sure to result in the putting on of flesh. The case of Captain Catlin[10] is a good example. Owing to an accident of war, he lost a leg, and ever since has had severe neuralgic pain referred to the lost leg. These attacks depend almost altogether on storms. In years of fewest storms they are least numerous, and the bodily weight, which is never insufficient, rises. With their increase it lowers to a certain amount, beneath which it does not fall. His weight is, therefore, indirectly dependent upon the number of storms to the influence of which he is exposed. At present, however, we have to do most largely with the means of attaining that moderate share of stored-away fat which seems to indicate a state of nutritive prosperity and to be essential to those physical needs, such as protection and padding, which fat subserves, no less than to its æsthetic value, as rounding the curves of the human form. The study of the amount of the different forms of diet which is needed by people at rest, and by those who are active, is valuable only to enable us to construct dietaries with care for masses of men and where economy is an object. In dealing with cases such as I shall describe, it is needful usually to give and to have digested a surplus of food, so that we are more concerned now to know the forms of food which thin or fatten, and the means which aid us to digest temporarily an excess. As to quantity, it suffices to say that while by lessening food we may easily and surely make people lose weight, we cannot be sure to fatten by merely increasing the amount of food given; something more is wanted in the way of digestives or tonics to enable the patient to prepare and appropriate what is given, and but too often we fail miserably in all our means of giving capacity to assimilate food. As I have said before, and wish to repeat, to gain in fat is, in the feeble, nearly always to gain in blood; and I hope to point out in these pages some of the means by which these ends can be attained.