NOW that we know of radium emanation, we have a scientific explanation of the difference between natural curative waters when drunk at the spring and the same waters after being bottled and exported. Things may be chemically identical, and yet different--a reflection that should help to prevent us from becoming too dogmatic. This discovery about mineral waters has led to the invention of what may be called "artificial genuine waters"; they are mineral waters artificially impregnated with radium emanation. These have been used curatively with success. Following their use came that of radium baths, and then radium air-baths and radium inhalers. Patients can be put into a room whose air is impregnated with emanation, or they can inhale through a nozzle connected with a bottle. One naturally wonders how many more influences there may be in nature which have not yet been detected, and how many hygienic beliefs are consequently based on imperfect knowledge. What happens to the fresh air after it has been drawn into a building, heated in an apparatus, and distributed? Chemically the same it may be, but it differs a good deal in its effects from the air outside. And there is the question of prepared foods; is it enough that they be chemically the same as the natural product? * * * * * THE devising of new luxuries is of doubtful advantage; for not only is luxury itself enervating, but it is often not even achieved, for our needs and susceptibilities increase with their satisfaction. Soon it will not be necessary to have any circulation in your feet; nor to use warm foot-gear or warm your feet at the fire. The carpet on which you tread will itself be warm; or if it is not, you can make it so in a moment by merely pressing the ubiquitous and indispensable button in the wall. Stoop down and examine this magic carpet; it looks just like any ordinary unpretending piece of floor-furniture. But unravel some of its threads and you will find that they contain that all-pervading nerve of modern life--a wire. Upon a woolen thread is wound a tape made up of fine strands of nickel wire; over this again goes more wool, and so the wire is made invisible and flexible. A cord ending in a plug connects the carpet with the wall or the lighting fixture. One would think there was risk of the carpet going up in a puff of blue smoke; nor is one much reassured by the statement, in a scientific paper, that "when overheated, the resistance rises and cuts down the current, so that an automatic regulating action is given which prevents overheating." The rise of resistance would increase the quantity of heat generated, whereas the lessening of the current strength would only reduce the quantity of heat in the proportion of the square root of the diminution in current strength. * * * * *