appearance of polyneuritis, especially a certain predisposition 

 for it. This makes it desirable, when testing the rice, to 

 use animals previously infected, and also to subject more than 

 one animal, by preference half a dozen, to the experiment. 



White Boeloe rice reaped a year earlier, but milled at 

 the same time as Idjoean rice, gave generally speaking the 

 same results as the latter kind. 



In the case of animals which took a longer time to get 

 the disease, the symptons often broke out more suddenly 

 and in a worse degree, so that death could not be prevented 

 by giving them normal food. 



There are other factors which shorten the incubation 

 period or delay a complete recovery, such as the number and 

 the intensity of the attacks of polyneuritis already under- 

 gone, and the shortness of time which had elapsed since 

 recovery from a former attack. 



Without going too much into particulars as to these 

 factors, which are narrowly connected with the personal 

 predisposition already shown, the following table VI clearly 

 shows the influence which a former attack of disease exerts 

 in causing a speedier return of the symptoms of disease. 



TABLE VI. 



Showing the time in which animals, after a longer or 

 shorter period of recovery, again developed polyneuritis by 



White Rice for the War 



White Boeloe 



Polished Boeloe 



Office (sosoh). 



rice (sosoh). 



rice (sikat). 



14 days 



„ 



11 



14 „ 



13 



11 



16 „ 



_ 



14 



21 „ 



_ 



24 



31 „ 



" 



~ 



