- 16? - 



Occasionally there were seeming irregularites and contra- 

 dictions. In the case of one rice-bird out of 4 which had 

 been made ill with polished Idjoean rice (sikat), there was at 

 first improvement shown, and that during 10 days, when a 

 somewhat less-milled rice of the same kind (Idjoean sosoh) 

 was given. After these 10 days however the disease again 

 broke out, while in the case of the other test-animals this 

 preliminary improvement did not take place. 



Later we shall speak of an analogous case of anomaly 

 when describing the experiments for testing rice from the 

 prison in Loemadjang. 



Both these cases show how desirable it can sometimes be 

 to prolong the experimentation on rice-birds in order to 

 form an opinion as to a certain kind of rice which is in 

 every respect correct. 



VI. Experiments on Rice-birds, with Unpolished Rices, 

 ivhich had been preserved in Different Manners. 



After the above-described experiments, the influence which 

 various preservatives have on the desired protective working 

 of unpolished rice, could be determined with greater success. 



For this purpose, as had appeared desirable, experiments 

 were made on birds which had previously been made ill by 

 a one-sided food consisting of completely polished rice and 

 for each experiment at least three test-animals were used. 



After the birds had been fed on unpolished rice which 

 had been exposed to the working of various preservatives 

 for a shorter or longer time, examinations were made as to 

 whether the diseased birds recovered after eating this rice, 

 and if so, how long a time the disease had to be fought 

 against, or in what degree the symptoms of disease were 

 aggravated thereby. 



Of the various preservatives which had been taken into 

 consideration from other points of view, chloroform, carbon 

 tetrachloride and alcohol appeared to be the most satisfactory 



