Show COLORED LIGHT ON PLANTS ifft ta conr of ort beneat although the store of human knowledge on the subject of the attributes of colors is gradually growing and we have even gone so far as to differentiate the sounds caused by the falling of a ray of sunshine on claths cloths of various tints comparatively little is yet known of physiological effect of color on human beings the votaries vot aries of the blue glass craze which came into vogue some years ago who firmly believed that a bath in a flood of colored light was the finest restorative that tired and ailing humanity could have recourse to may possibly have been wiser in their generation than those who derided them whatever the effect of colored light on individuals may finally be determined to be its influence on plants is now unquestionably proved the use of glass of a green tint has for half a century been one of the peculiar characteristics of the plant houses at kew gardens near london in 1889 the experiment was made of substituting white glass for green in the east wing of the tropical fern house this was the result of the observation of the successful cultivation by an amateur horticulturist of ferns with full exposure to the light the improvement in the growth of the plants was remarkable in 1892 a portion of the west wing was also re glazed and the new temperate fern house was wholly glazed with white glass the result has been so markedly beneficial that it has now been determined ter mined to abandon entirely the future use of green glass |