These things Dr. Jaeger considers that the experience of many readers will confirm, and that they have great practical importance in connection with his system. The German names given to these odorous substances are _Lust und Unlust Stoffe_, substances of pleasure and dislike. The former are thought by the Doctor to be the healing powers of the body, which heighten all the vital actions and its powers of resistance against contagion of all kinds. Sheep’s wool in particular attracts these substances of pleasure, while the plant fibre favors the accumulation of the substances of dislike, with all their evil consequences. This last fact, which the German scientific medical world considers Dr. Jaeger has proved, is supposed to be of the greatest importance, as showing how to raise the resistibility of the human body against contagious disease. The observations made extend to diphtheria, cholera, typhus, smallpox, measles, whooping-cough, and influenza. I have endeavored thus far to divest the subject, as far as possible, of scientific matter, so that the principle may be easily understood by those who have made no previous study of these or any kindred subjects, relating to the hygiene and sanitary management of the body. I will now turn to the more practical considerations of the materials and shapes of the clothing recommended. Dr. Jaeger advocates the use of nothing but wool, both for clothing and also for the bed and bedding. No half-measures will answer; even the linings of coats and dresses must be of wool, and men’s collars, and even women’s stay-laces, must be of the same. The material which, after much consideration, he has selected, is what is called “stockingette web,” which is merely woollen yarn woven in an elastic manner, like jerseys and stockings, and the woollen and merino under-shirts and drawers, now in common use. The somewhat clumsy name “stockingette” owes its origin to the fact that there was no technical name for that kind of elastic weaving which is applied to stockings, and which was called into existence as a “piece” material by the fashion of wearing jerseys, three or four years ago. Dr. Jaeger considers this weaving porous and supple and more durable than flannel; while they feel more comfortable on the skin, and areless liable to shrink than flannel, when in the hands of the washerwomen.