BLUE GLASS. 131 



roof and sides, into whicli one half of a litter of 

 pigs was placed, while the remainder were kept in 

 an ordinary pen. The former lot gained during 

 the winter twelve pounds more than the latter. A 

 sick calf was then placed in a blue- glass pen and it 

 recovered. A deaf and rheumatic mule was cured 

 of his infirmities by having blue glass transoms 

 over the door of his stall, through which the sun- 

 light was thrown upon his neck night and morning. 

 These experiments were widely published, and 

 others soon added their testimony to the wonder- 

 ful stimulating and curative properties of blue 

 light. A lemon tree had a portion of its limbs 

 exposed to light which came through some blue 

 panes of glass, while the remainder received ordi- 

 nary sunlight. The former grew with great vigor 

 and bore a heavy crop of fruit, while the latter 

 languished and bore no fruit. A sickly child re- 

 gained its health when blue curtains were placed 

 in the window. A lady aiflicted with rheumatism 

 and baldness was cured of both by means of a few 

 panes of blue glass in her window. Some plants 

 growing out of doors were wonderfully stimulated 

 by having blue gauze stretched over them, while, 

 strange to say, all insect enemies were thereby de- 

 stroyed. Acting upon this suggestion. General 

 Pleasanton then introduced blue glass into the Vi^in- 

 dows of his house, with the result that all the flies 



