ir,r, 



test-am mals recovered in the beginning in the course of 2 

 or 3 days, when fed on unactive rice. This was because they 

 had a comparatively large quantity of polished rice at their 

 disposition, from which they could first pick out those grains on 

 which the largest quantity of silver-skin still remained. When 

 for each bird not more than a day's rations, of ± 5 gram, 

 was given, a rapid recovery was quite out of the question. 

 With polished kinds of rice which showed a defeciency 

 in protective elements the "incubation period" was, as a priori 

 might be expected, dependent on the more or less degree of 

 milling. The following table V, which also justifies some 

 other conclusions gives moreover confirmation of this 

 statement. The ciphers given herein show the number of 

 days in which the symptoms of polyneuritis began to break 

 out on several healthy animals which had not yet been 

 experimented on, while the lines represent those cases in 

 which other diseases or causes of death must be accepted, 

 and also those in which the symptoms of the disease were 

 not apparent within 2 months, — cases therefore of practical 

 immunity. 



TABLE V. 



White Idjoean 



Polished idem 



White rice 



for the j 



Polished idem 



rice (sosoh). 



(sikat). 



War Office (sosoh). 



(sikat). 



21 



16 



25 





17 



33 



20 



29 





23 



— 



20 



29 





30 



51 



21 



31 





38 





26 



36 







62 



50 



- 





46 



The time in which the symptoms of disease begin to 

 appear varies from 3 weeks to 2 months. The above-described 

 symptoms seldom appeared earlier, and the cases of immunity 

 were still more scarce. The difference of time of "incubation" 

 points to the significance of individual qualities for the 



