56 a EXPERIMENT STATION. [Jan. 1919. 



treatment of the young pigs. The firm from which the supply 

 was obtained up to the present year has devoted so much 

 time and attention to the preparation of the various biological 

 products used in the army for the treatment of the soldiers 

 that it became necessary for them to discontinue the manu- 

 facture and distribution of some of their biological products 

 for the treatment and prevention of disease of domestic ani- 

 mals. This has been a serious handicap in the hog cholera 

 studies that are being carried on in the department, because 

 of the fact that it has no longer been possible to obtain the 

 same series of preparations that have been used in the earlier 

 investigation, and which it was hoped could be continued to 

 the completion of the experiment. 



