It is the duty of everyone to properly cleanse the teeth at least once daily--to do so after each meal would be even still better. This should be done with a moderately soft brush, with which it is unnecessary to use tooth-powders or lotions--though many prefer to do so. Where something of the kind is desired, ordinary lime-water is perhaps as satisfactory as anything else; peroxide of hydrogen, diluted eight or ten times with water, to which a pinch or two of ordinary cooking soda has been added, undoubtedly aids the cleansing process, and has the advantage that it leaves a pleasant after-taste in the mouth. In brushing the teeth care should be taken that every part of the tooth receives attention, it being not sufficient, as is so often done, merely to brush the front. It should be the practice of everyone to have the teeth looked over at least once a year by a good dentist, as even where cleansing is diligently performed decay frequently sets in on their inner sides. The utmost care should be taken of the permanent teeth especially, and as long as it is possible to prevent it no one should be allowed to pull them. There can be no doubt that life is shortened by the early loss of the permanent teeth in most, if not in all, cases--not to count loss in health and happiness that follows their absence. _Clothing,--Material and Color._--Clothing will be considered in this article only as regards its function of properly protecting the body, which it does by preventing the escape of heat, thus keeping the body warm, or, under other circumstances, by keeping out excessive heat or cold. Materials of which clothing is made differ very greatly in their ability to accomplish the object just mentioned, some being comparatively poor conductors of heat and hence fulfill the desired function admirably, while others, for opposite reasons, are of comparatively little value for this purpose. In general it may be said that structures of animal origin, such as wool and silk, are much poorer heat conductors than those obtained from the vegetable world, and as a consequence the former are justly held in much higher esteem as material for clothing than the latter. It should not be forgotten, however, that the protective value of a fabric also depends upon the manner in which it is woven, since those that are loosely constructed are much warmer, other things being equal, than those that are put together more closely; this depends upon the fact that in the former there are innumerable small cavities between the fibers in which air is contained, and as this substance is a very poor conductor of heat, it follows that a garment made loosely and containing many such chambers is warmer than where the number is less. It may well be the case that a fabric constructed of a material which is a poor conductor of heat and closely woven may be actually cooler than another composed of a substance which is a much better conductor of heat but of a loose texture.