- 173 — 



of the poured off water did not any more become less. 

 It now appeared that not less than 0,34% of the original 

 P 2 5 content had passed into the water used. Through the 

 process of washing therefore the P 2 5 amount of this more 

 matured sample of rice had sunk to 0,18°/ i.e. to one third. 

 It further appeared that this washed rice, after having 

 immediately been speedily dried in the air, had become 

 absolutely unfit to cure polyneuritic rice-birds. 



Where now the proportions, especially concerning the 

 unpolished rice, were here found to be so much less favou- 

 rable than had been brought to light by other investigators, 

 it was hereby still more distinctly shown how worthless ii 

 is to fix conditions for the excellency of this rice, unless at 

 the same time the obligation is imposed, that while washing 

 out the rice, the necessary carefulness and precautions are 

 to be kept in view. With regard to these precautions, there 

 may indeed be a difference made between freshly husked 

 and more mature kinds of rice, but in any case the washing 

 out, and especially the rubbing practised thereby — also 

 in connection with the solubility of the physiological active 

 substances of unpolished rice — may not last too long or take 

 place too rigorously. 



3 rd . The Steaming of the Rice has scarcely any Influence 

 on the P 2 5 Content. 



Of the occasions in which the proofs as to taste were 

 made by steaming rice in the hospital, which proofs are 

 described at the beginning of this treatise, three were utilized 

 for collecting the water used for steaming the different 

 kinds of rice and estimating the P 2 5 contained therein. 



The losses of P 2 5 for unpolished rice which could thus be 

 proved, amounted successively to 0,012, 0,0086 and 0,004%, 

 on an average thus, 0,0082%. The rice for the troops showed 

 a somewhat smaller average in the P 2 5 amount — 0,0075% — 

 in the water used for steaming. The reduction was found 

 to be respectively 0,0115, 0,008 and 0,003%. The losses of 

 Pj,O a by escape into the steaming water of white rice (sosoh) 



