HYGIENE.--But I fancy you ask me, Is there any hope that in the future evolution, and with it adjustment to environment, will carry man so far that an ideal state of health will be the lot of all? This is what hygiene promises. Is it a vain hope? If we look at what older sciences have done for man we find much to encourage us. In astronomy, by the aid of mathematics, we can calculate with certitude the date of future eclipses. In many other sciences we can make accurate predictions and accomplish results of the greatest importance. Indeed, science has become almost our only authority. Imperfect as it yet is, we trust it, perhaps, too implicitly. The science of hygiene is the youngest of all the sciences. Not that the Greeks, the Hebrews, the Hindoos and Chinese did not have some practical knowledge on the subject, but it was rude and empirical. With the discoveries of micro-organisms as the cause of a series of the worst diseases, we have begun to place hygiene alongside mathematics and chemistry. We now know the origin of many diseases which formerly were enveloped in mystery. Can we remove them? That is the next task. Hygiene will in the future busy itself with this great question. It has, it is believed, already made many cities proof, or almost proof, against cholera and yellow fever. It will try to make them proof against other contagious diseases also, and it will without doubt succeed. But its work will not then have been accomplished. We may avoid the causes of disease and still be puny creatures. Our great task will be the building up of bodies equal to the needs of our environment. This we have, in a small way, already begun to do--imitating the ancient Greeks--in our schools of physical culture, where the body can be trained up to its best, and also in our laboratories for psychological research, in which the relation of mind and body are being carefully investigated, where every subject connected with every function is being studied, even weariness, anger, hope, despair, drink, food, sleep, the weather, and their effects on function. The results of such knowledge will prove beyond a doubt that the health of the body, as well as of the mind, is of the highest importance for success in life, for happiness and usefulness, and that we can do much to secure both. My own personal hope for the future of human health lies in the evolution and spread of this gospel of hygiene.