CONTAGIOUS DISEASES OF CATTLE, 443 



Inoculation. — Inoculation has been practiced for a number of 

 years, at first with not much success; but later with a great de- 

 gree of success. Inoculation produces not the disease, but a 

 fever which is easily overcome; after which the animal is safe 

 from pleuro-pneumonia. The method of inoculation is as fol- 

 lows: The blood and the serous and frothy liquid are squeezed 

 from the lungs of a diseased animal in the first stages of pleuro- 

 pneumonia. The fluid while warm is placed in a strainer, over 

 a clean glass bowl covered over with cloths to prevent dust, and 

 to keep it warm. The fluid, if not required for immediate use, 

 is to be placed in glass tubes or bottles, and the tube hermetically 

 sealed by a blow-pipe flame. The tip of the tail should be se- 

 lected for inoculation, and the superior is better than the in- 

 ferior surface of the tip. The tip of the tail is selected because 

 it can be easily amputated, should giangrene occur. The hair 

 should be removed from the spot, and the skin scarified super- 

 ficially, A single drop of the virus should then be placed on the 

 scarified spot. At a period varying from a week to two months, 

 a slight heat and swelling occurs around the inoculated spot; 

 generally, however, the eruption manifests itself from the ninth 

 to the sixteenth day, accompanied by slight rigor, loss of appetite, 

 and slightly diminished secretion of milk. The inoculation 

 method has not yet been fully established. Laws have been en- 

 acted whereby all animals suffering from an attack of pleuro- 

 pneumonia, or in any way having been exposed to the infection, 

 shall be slaughtered within a specified time. 



FOOT AND MOUTH DISEASE. 



This disease is also known as eczema, contagiosa, and by many 

 other names. Tliis is a liighly contagious and infectious febrile 

 disease, characterized l)y secular eruptions in the mouth, between 

 the pedal digits and around the coronets. In some cases the 

 eruptions are absent in the mouth and present only in tlie feet, 

 and vice versa. Eruptions arc sometimes seen in connection with 

 the mammary glands; when such occurs the milk is unfit for use. 



