TUBERCULOSIS. 



WJiat it is. 

 * " This is a specific bacteridian affection, due to a bacillus, 

 and characterized by a specific deposit of cells, large and 

 small, in a special net-work, but without blood-vessels. It is 

 situated by preference in the groups of lymphatic glands, 

 or in the microscopic gland-like tissue of the difierent organs, 

 and may be seen in all stages, from the simple redness and 

 congestion in which the deposit is only commencing, through 

 the solid grayish tubercle to the soft yellowish, cheese-like 

 mass resulting from the softening of the latter." 



JVavies under ivhich hnoion. 

 f " This disease under one name or another has been 

 known from the earliest times. According to ancient authors 

 on medicine, as Hippocrates, 400 B. C, Aristotle, 330 B. C, 

 Galen, 180 A. D., and others, it consisted of abscesses or 

 ulcers in the lungs. This disease has been known by vari- 

 ous names, as consumption, pulmonary consumption, tuber- 

 culous consumption, consumption of the bowels, phthisis, 

 pulmonary phthisis, tuberculous phthisis, pulmonary ulcera- 

 tion, pining, wasting of the lungs, pearl disease, perlsucht, 

 nymphomania, satyriasis, knots, kernels, grapes, angleberries, 

 human tuberculosis, bovine tuberculosis, tubercle, miliary 

 tubercle, tubercular disease and tuberculosis. The last 

 name is more widely used at the present time than any of 

 the others." 



Distribution. 



f " Tuberculosis occurs in cattle wherever they are kept 

 in domestication, but seems to be most prevalent where 

 consumption is most common in the human family. It is 

 almost unknown in Iceland, and is very rare in polar coun- 

 tries generally, but increases as we approach warm climates. 

 It appears to be very common in Italy and Algeria ; and. 



* " The Farmer's Veterinarj' Adviser," Prof. James Law. 



t Bulletin No. 3, Hatch Experiment Station of the Massachusetts Agricultural 

 College, January, 1889, C. H. Fernald. 



