from an Agricultural and Veterinary Point of View, 117 
the sickly period of the year. And so with other animal dis- 
orders of a contagious character, which are widespread, and so 
treacherous in their infectiveness and insidious in their progress, 
that the skill and vigilance of man cannot grapple with them. 
For these the benefits of protective inoculation may be invoked. 
Daily the disciples of Pasteur enlarge the territory in which 
he was the first to break ground, and reap such a marvellous 
harvest ; and the special microbe of each specific disease of man 
and beast is being revealed, and in some instances cultivated so 
as to serve as a defence against its uncultivated congener. 
One of the most treacherous and invasive, as well as destruc- 
tive diseases of cattle, which is sapping the vitality of the best 
breeds, and which is communicable from the bovine to some 
other species — most probably also to mankind — through con- 
suming infective milk and flesh, is Tuberculosis, or " Consump- 
tion." The microbe, or bacillus, of this infectious scourge was 
first clearly demonstrated by Koch, though previously Toussaint 
had found a micro-organism somewhat unlike this, but which 
may have been another form of the bacillus. He also suc- 
ceeded in producing a culture fluid, which, when inoculated, 
Fig. 13. — From the Tuberculous Dei)os'd in the Lung of a Coiv. 
Showing two large or " giant-cells," and two small cells, containing the germs or bacilli 
of Tuberculosis. Magnified 700 times. — Klein. 
caused the disease. Gerlach, of the Berlin Veterinary School, 
had also before this proved the ready transmissibility of tuber- 
culosis, being corroborated by Toussaint, Chauveau, and others. 
But, unfortunately, this bacillus has not yet been made sub- 
servient to man in affording protection from consumption. 
The bacillus of Glanders has been discovered and cultivated 
by Schutz and Loffler, but it does not yet ensure protection from 
that malignant pest of horses. 
Micro-organisms (micrococci) were observed in Cattle-plague 
