1912.] PUBLIC DOCUMENT — No. 31. 79 



infection, wliieli aeeoinits for the recurrence of the disease. To 

 determine to what extent this may he the source of such recur- 

 rence of tuhercnlosis of farm animals is the chief aim of the 

 present investigations. 



In addition to the experiment with milk, to determine to 

 what extent it may he the medium for the transmission of hovine 

 tuberculosis, there have been started preliminary studies to de- 

 termine the nature, cause, means of spread, treatment and pre- 

 vention of several other animal diseases, including an extremely 

 obscure and fatal one of fowls. The work has not progressed 

 snthciently, at this date, to warrant more than a mention of the 

 fact in this report. 



The diagnosis work consists of the examination of material 

 that is sent in by stockmen from animals snffering with disease, 

 and of material suspected of causing disease. During the past 

 year specimens have been received in larger numbers than ever 

 before, and from practically every part of the State. As soon 

 as such specimens arrive they are subjected to a variety of 

 examinations, microscopic and bacteriological, to determine the 

 nature of the material and the possible relation to the disease 

 causing a loss to the stockman. After the completion of the 

 examination, a report upon the nature of the specimen and 

 directions for the treatment or prevention of the disease is sent 

 to the farmer from whom the material was received. While not 

 possible to arrive at a correct diagnosis in every instance, in 

 many cases it is possible to return to the sender of the specimen 

 such definite information as to the nature of the material and 

 the disorder as to enable him, by following the directions sent 

 in the report, to eradicate, cure or prevent the disease. 



Some of the most interesting and important specimens that 

 have come under observation in the diagnosis work the past year 

 are: tuberculosis of garbage-fed hogs; tubercular orchitis of 

 bull ; pulmonary phthisis of man ; pericarditis of cattle due to 

 foreign bodies ; lobar pneumonia ; papilloma and fibroma of 

 bovines ; Paris green poisoning of pigs ; chicken pox ; coccidiosis 

 and favus of birds. 



In addition, a large number of samples of fodder, grain, beef 

 scrap and other food materials have been examined as to quality 

 and the presence of substances liable to cause disease when fed 



