338 Journal of Agricultural Research voi. \^, N0.9 



the antibodies of the blood, and it is also to be recommended on account 

 of the fact that it results in a large yield of serum. 



The fact that this serum may be heated for half an hour at 60° C. 

 without noticeable impairment of its potency is of much practical 

 importance because there is thus afforded a ready means for safeguard- 

 ing it against infection with the virus of the foot-and-mouth disease. 



Anyone contemplating the practical application of the process is 

 urged, at the beginning at least, to follow the method described herein, 

 and to use only the common white navy bean for preparing the bean 

 extract. It is hoped that the method will soon be adopted on a large 

 scale by commercial producers of serum. 



