Journal of Agriculture, Victoria. [lo Aug., 191 2. 



Bavaria, 100,000. In Germany, in 1890. 800,000 were affected, and in 

 1892 over 4,000,000. Though the mortality is not high in the 

 disease, the loss from wasting, fever, &c., is enormous; so much so, that 

 a system of slaughter of all affected and in contact animals is carried 

 on as the cheapest method of checking its ravages (Figs. 25, 26). Its. 

 seriousness may be gauged from the cablegrams appearing in the press of 

 the last outbreak in Great Britain. 



FIG. 



26. FOOT AND MOUTH DISEASE. CARCASES OF CATTLE PILED 

 WITH WOOD READY FOR BURNING. 



No lecture on contagious diseases would be complete without some re- 

 ference to tuberculosis, the disease upon which there is mere literature 

 than on almost any other subject. It is known as the " White Plague,"' 

 and has been regarded by scientists as the only disease which is capable 

 of exterminating the human race, and this mainly because of its insidious- 

 nature ; for it is pnssibL'fnr one tO' contract the disease in youth or infancy 



and to be quite unaware- 

 nf it until later in life — - 

 say upon gaining ma- 

 turitv. when, owing 10' 

 some debilitating in- 

 fluence, the protection 

 aft'orded up to that time 

 bv the white corpuscles 

 of the blood is broken 

 down, and the organism 

 spreads through the 

 system, bringing with it' 

 that train of symptoms 

 which so many are fami 

 liar with either through 

 the loss of relatives c r^ 

 friends from consumption (Figs. 27, 28). 



The organism responsible for the disease is from i /4.000th to 

 T/i2,oooth of an inch long, and from 1/ 24,000th to i /72,000th of an 

 inch broad (Fig. 29). The disease is communicable from animal to man, 

 and vice versa, and^ unfortunately, in the early stages,, does not produce- 

 anv visible symptoms (Figs. 30, 31). The symptoms are usually recog- 



FIG 27. CHRONIC CHEESY TUBERCULOUS 

 PNEUMONIA. SECTION OF LOBE OF COW's LUNG. 



