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 



