As a logical consequence of the above, we must try to enjoy sunshine on mountains, or on the terraces of high buildings, as there can be no doubt but that sunshine is more beneficial in such places. In high altitudes sunshine is far more warming than lower down, probably due to the fact that the sun’s rays pass fewer strata with vapor and foreign substances, and thus less of their warmth is absorbed. Thus we can explain the observations that, by exposure for a certain time to the rays of the sun on the top of high mountains in mid-winter, erythematous or eczematous eruptions were produced. At such great heights the air is usually very dry, and so there is less loss of heat from the body. Therefore we can sit comfortably in the sun at such heights without an overcoat, even in winter, whereas several hundred meters lower down we should feel cold even with an overcoat on, especially in a coast climate. Let us be grateful for every ray of sunshine and take advantage of it. Some ladies avoid the sun, but it would be wiser to seek it and, if possible, to expose our whole bodies to its rays. Let us remove all the curtains from the rooms in which we sleep or sit, especially from our work room. In the train let us sit on the sunny side, and not draw the curtain unless we are reading; in short, let us seek the sun wherever it shines. We shall soon observe how much better we feel after a long sojourn in the sun. We have often been surprised at the appearance of patients whom we have sent for a holiday to the Riviera in Egypt or to other sunny places. Thus we have often seen pale patients come back rosy-cheeked and flourishing, and in our own case we have observed the same thing after staying in California, Arizona, Mexico, and Florida for several weeks. There is no denying that, as a rule, those who spend much time in the sun look better and healthier than those who live in dark rooms or offices. It must be understood that we are talking about sunshine at a moderate temperature. But even a somewhat higher temperature, with sunshine, can do no harm, especially to persons suffering from chronic kidney trouble. In old age, as in other conditions of athyroidia, we often find chronic interstitial nephritis and sluggish kidney functions. Therefore we should relieve the kidneys of any overwork and make the skin do more, which can be accomplished by warm sunshine. Old people, if their means allow it, should never be left to pass a winter in cold climates, but should be sent to warm sunny climates like the Riviera, Egypt, or California or Florida in America. They require as much sunshine as possible. Americans may use with great profit the climatological charts of Dr. Charles Denison, of Denver, Colo., which show with great exactness those parts of America where the greatest number of sunny days occur.