176 CONTAGIOUS DISEASES. 



the syringe adapted carefully, and care taken that all the fluid 

 is injected into the vein before withdrawing, first the syringe, 

 then the cannula, there will be little or no danger of this 

 occurring. 



By the Contagious Diseases (Animals) Act, 1878, it is enacted 

 that all cattle suffering from pleuro-pneumonia are to be imme- 

 diately slaughtered; and by the Pleuro-Pneumonia Slaughter 

 Order of 1888, all cattle being or having been in the same 

 field, shed, or other place, or in the same herd, or otherwise in 

 contact with cattle affected with pleuro-pneumonia, are to be 

 slaughtered within ten days after the fact of their having been 

 so in contact has been ascertained, or within such further period 

 as the Privy Council may in any case direct. All cattle which 

 have been certified by an inspector of the Privy Council to 

 have been in any way exposed to the infection of pleuro- 

 pneumonia are also to be slaughtered within such period as the 

 Privy Council may direct. 



THE PATHOGENIC MICROBE OF PLEURO-PNEUMONIA. 



At the meeting of the National Veterinary Medical Associa- 

 tion held in Edinburgh in 1886, I stated that pleuro-pneumonia 

 was due to an organism. This announcement was received 

 with derision by certain members present. At that time, after 

 several years' work, I had found two organisms, a bacillus and 

 a micrococcus, and was of opinion that the micrococcus was 

 the pathogenic microbe. The question has been since studied 

 by various Continental observers. Lustig found that there are 

 generally four organisms in the exudates of pleuro. These 

 four, however, may be classified into two groups, as seen under 

 the microscope : — 1st. A bacillus which rapidly liquefies gelatine 

 in cultivation tnbes : 2d. Micrococci, which are proved by culti- 

 vation to be of three kinds — (a.) a micrococcus whose colonies 

 are white, like boiled white of egg ; (&.) a micrococcus the cul- 

 tivations from which assume a golden yellow colour ; and (c.) a 

 micrococcus whose cultures on gelatine resemble drops of wax. 

 These four organisms were studied by Lustig in 1885, and by 

 Cornil and Babes in 1886, but the results which the latter 

 obtained were not very precise ; and they concluded that their 



