TUBERCULOSIS. 227 



with this difficulty of diagnosis, that in a paper read at a 

 meeting of the Pathological Section of the British Medical 

 Association, held in Dublin, August, 1887, we stated that it 

 appeared to us "that where, as is very frequently the case 

 with cows kept in towns, a complete history of the diseased 

 condition of the udder is not obtainable, a differential diag- 

 nosis of mammitis (inflammation of the milk glands) is by 

 no means easy, except by microscopic demonstration of the 



Tubercle bacilli arranged around a closed up milk-duct in a case of 

 Tuberculous disease of the udder of a cow. x 1000. 



bacilli in the milk ; which may also fail if a most careful 

 search is not made" ; and Principal Walley, dealing with 

 the same subject, says, " that he could not undertake to 

 diagnose, with accuracy, tubercular mammitis in every case, 

 nor even in a majority of cases " ; and he states that in 

 specimens of the udders of tuberculous cows he has ex- 

 amined, after death, he has found good examples of tubercu- 

 losis in the mucous membrane of the milk sinuses without 



