146 SPECIAL CATTLE THERAPY 



open these abscesses before a positive diagnosis of their 

 non-tuberculous character is made, by means of tuber- 

 culin, is not acting upon good judgment. The surgical 

 invasion can have no ultimate value if the case is 

 tuberculous and only endangers other members of the 

 herd with the possibility of their becoming infected 

 from the discharges. 



Localized tuberculous abscesses are never a contra- 

 indication with regard to the tuberculin test, nor are 

 other localized pus collections of sufficient import to 

 seriously interfere with the intelligent interpretation 

 of the tuberculin reaction. The ophthalmic method 

 has been shown to be just as reliable in the disease 

 in bovines as the ophthalmic mallein application for 

 diagnosing glanders in equines, and it would be the 

 method of choice here. It is more prompt than the 

 subcutaneous method and, besides, provides for a 

 distinct control of each subject tested in the eye which 

 has not been subjected to the tuberculin. 



Extensive enlargement of the bronchial and medias- 

 tinal lymphatic glands has been known to produce 

 various acute clinical manifestations. One of the al- 

 leged conditions resulting from an extensive enlarge- 

 ment of these glands is a thoracic choke, presumably 

 due to encroachment of the swollen glands on the 

 esophagus. No doubt cases of thoracic choke from this 

 cause are very uncommon, because the glandular tume- 

 faction must always assume immense proportions be- 

 fore it can interfere seriously with the limits of flex- 

 ibility of the esophagus. 



In the liver even very extensive tubercular changes 

 rarely produce clinical signs which can be diagnosed 

 as being produced by this disease. Why this should be 

 true we can not explain, unless it be due to the fact 



