A manual of hygiene and sanitation . swell as abroad. More might also be said in reference to the possibleand probable chemic activity of the light in and upon themetabolic processes of the animal body; but as there isstill the uncertainty of hypothesis and theory, it may bewiser simply to leave the foregoing suggestions as foodfor thought and incentives to further research and investi-gation. The importance of an abundance of daylight in allrooms where much work is to be done should not be 1 British Medical Journal, September 30, 1899. Philadelphia MedicalJourual, October 7, 1899. THERAPEUTIC
A manual of hygiene and sanitation . swell as abroad. More might also be said in reference to the possibleand probable chemic activity of the light in and upon themetabolic processes of the animal body; but as there isstill the uncertainty of hypothesis and theory, it may bewiser simply to leave the foregoing suggestions as foodfor thought and incentives to further research and investi-gation. The importance of an abundance of daylight in allrooms where much work is to be done should not be 1 British Medical Journal, September 30, 1899. Philadelphia MedicalJourual, October 7, 1899. THERAPEUTIC USE OF SUNLIGHT. 297 overlooked. Not only is it necessary for the conservationof the influences just mentioned, and as a destroyer of path-ogenic organisms, but it is also more agreeable and saferfor tlie eyesight than any form of artificial light yet de-vised. An important aid to the illumination of dark in-teriors has been the recent introduction of panes or platesof glass with a series of ridges or prisms, which refract Fig. Action of prismatic glass in projecting light. (Haeeington.) and diffuse throughout a room light which would otherwiseilluminate it but partially or not at all. The prisms aremade with various angles, and may be placed either inthe ordinary window sash or in projecting canopies,according to whether the direct light from the sky isobstructed or not. (Figs. 47 and 48.) The relation of artificial lighting to ventilation has 298 PERSONAL HYGIENE. been discussed. In addition to this point, the quantityof light supplied and its steadiness have an important Fig. 48.
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