PLEUEO-PNEUMONIA. l73 



no effect upon an animal previously inoculated or having had 

 the disease. 



" 5. The inoculated animal braves the epizootic influences 

 with impunity, and fattens better and more rapidly than those 

 in the same atmosphere with it that have not been inoculated. 



" 6. The inoculation should be performed with prudence and 

 circumspection, upon lean animals in preference ; and towards 

 the tenth day after the operation a saline purge may be given, 

 and repeated if necessary. 



" 7. By inoculating pleuro-pneumonia a new disease is pro- 

 duced ; the affection of the lungs, with all its peculiar characters, 

 is localised in some part on the exterior, but whether it occasions 

 apparent morbid manifestations or not, the inoculated animal is 

 preserved from pleuro-pneumonia. 



" 8. The virus is of a specific nature ; it does not always 

 act as a virus. The bovine race alone is affected by its ino- 

 culation, since other animals of different races, inoculated in 

 the same manner, and with the same liquid, experience no 

 ill effects." 



Method of inoculation. — The virus is to be selected from the 

 interlobular tissue of a lung in the first stage of a mild attack. 

 The lung will then be found distended with a yellow semi-fluid 

 exudate. All parts of the lung which present any appearance of 

 dark red colour, and are consolidated, or which have the appear- 

 ance of being gangrenous, should at all times be avoided. The 

 selected portion of lung, after having been cut along the lymph 

 spaces to allow the fluid to ooze out, is to be placed whilst warm 

 in a strainer, over a clean stoneware or glass bowl, covered over 

 by flannel or cloths, to keep in the warmth and to prevent dust, 

 &c. gaining access. In a short time a quantity of clear yellow 

 fluid will be obtained, which, if not required for immediate use, 

 is to be enclosed in glass tubes, about four inches long, three- 

 eighths of an inch in diameter, and, when filled, hermetically 

 closed by a blow-pipe, flame. 



The tip of the tail is tlie spot which should be selected for 

 inoculation, and a single drop of the virus is sufiicient. It is 

 better to inoculate on the upper than on the lower surface of the 

 tip of the tail, removing the hair, and then slightly scarifying 

 the skin, the scarification being quite superficial. The point of 



