— 195 - 



5 th . A new method of chemical investigation better enables 

 us to judge of this value. This method consists in the 

 estimation of the spirit dry-residue, according to a 

 process which has been fully described in the text. 

 As criterion the dry-residue limit was to be fixed 

 between 0,55 and 0,6%. 



6 th . The physiological test with the help of test-animals is 

 at present the only one which leads to a never-failing, 

 always correct judgment. 



The evident suitability of rice-birds for this purpose 

 has led to a method of investigation which in every 

 respect deserves recommendation. 



7 th . It appears more and more distinctly that requirements 

 for an adequate activity of rice are completely worthless, 

 if at the same time certain stipulations are not made 

 as to the treatment of the rice, viz. the washing and 

 steaming, processes to which the rice must be subjected 

 before it is ready for consumption. 



Appendix. 



Shortly before this treatise went to press it appeared that 

 in the "silver-skin rice 4 th quality" received October 16—1913 

 from Tjikampek, and which has also been mentioned in 

 table IX, an example had been found of the kind of rice 

 which had so long been vainly sought. This was a specimen 

 with a \\ 2 5 amount lower than the standard norma of 0,4% 

 and which notwithstanding this was sufficiently active. 



At the same time this gave an additional proof of the 

 reliability of the spirit-test. 



The P 2 5 amount namely was found to be 0,383% (without 

 previous ignition with KN0 3 and NaC0 3 : 0,35%) so that on 

 this ground it would have to be declared as insufficiently 

 active. 



The spirit dry-residue on the contrary amounted to 0,793%, 

 a quantity lying so far beyond the fixed limit, that not only 



