322 



THE VITAMINES 



In 1912 Raczynski (1115c) formulated a very interesting theory, 

 quite in accord with the domestication theory of Kassowitz. He 

 thought rickets developed because of a lack of sunlight, a view which 

 seems to have been completely confirmed by the newest experimental 

 investigations. Huldschinsky (1115d) was able to cure rickets by 

 means of alpine light, since the X-ray showed a marked deposition 

 of calcium. Mengert (1115e) used the quartz lamp for prophylactic 

 purposes and Erlacher (1115f) succeeded by this means, in favor- 



k 3* 



^^^ ^(P f . . 





FIG. 63. X-RAY DIAGNOSIS OF RICKETS AND THE EFFECT OF COD LIVEII OIL 

 THERAPY SEEN BY THIS METHOD 



Left, May 22, 1920; right, October 31, 1920 (Hess) 



ably influencing 46 cases of rickets, without any change in diet. 

 Hess and linger (1115g) used sunlight for the same purpose, with- 

 out any dietary changes, and they (1115h) attributed the seasonal 

 variations in the incidence of rickets to the effect of sunlight. This 

 explanation, among other factors, sounds quite plausible. 



In order to follow the course of the therapeutic measures, it is not 

 strictly necessary to carry out metabolism experiments. It may be 

 studied by means of the X-ray, a method utilized by a number of 



