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although the P 2 5 content is less than 0,4%. But besides 

 this, it is distinctly proved that a P 2 5 amount of 0,4% and 

 higher in rice does not always guarantee the desired activity. 

 Generally speaking, these investigations have shown that 

 the collective name "rice" includes, to a certain degree, 

 all kinds of varieties and possibilities as to the relation 

 between the P 2 5 content and the physiological effectiveness. 



At first there was only a great measure of probability 

 acquired for the contrasting case caused by Minbury Jail 

 rice, namely that even a higher P 2 5 amount than 0,4% does 

 not necessarily ensure its due activity. It appeared, for 

 instance, that white Boeloe rice (sosoh) with 0.37% P 2 5 

 was of so little activity that by enlarging the P 2 5 amount 

 with 0,03% to 0,4% (by less milling of the rice) there was 

 not even a certainty that sufficient activity was assurred. 



Later, however, there were more direct and more distinct 

 proofs obtained there for, first, in the month of May of this 

 year, through examining unpolished rice which was furnished 

 to the prison at Loemadjang, and afterwards, last October, 

 by the investigation of a sample of white rice which came 

 from kampong Kramat, near Weltevreden, and which also 

 did not give sufficient protection against beri-beri. 



The reason for the first investigation was a considerable 

 increase of beri-beri patients last March, amongst the 

 prisoners at Loemadjang, and this notwithstanding that 

 they were dieted on unpolished rice. It was natural to seek 

 the reason of this increase in the bad quality of their 

 principle article of diet. In order to obtain a certainty as 

 to this supposition, two samples were presented for investiga- 

 tion at the Chemical Laboratory here, one sample being 

 taken from the nearly used up store, and the other from 

 the quantity which was soon to be delivered. With regard 

 to the P 2 5 content, it was found that the first named rice 

 contained 0,41% P 2 o 5 (on dried material 0,478%) and the 

 second sample had 0,39% (moisture free material showed 

 0,457%). According to the Frasek-Stanton standard the first 



