46 The Farmer's Veterinary Adviser. 



Leptothrix. Filaments of Connected very Small Cells. 

 Leptothrix Buccalis of Month and Carious Teeth. 



" Yaginse of Generative Organs in Enzootic 



Abortion in Cattle. 



Bacillus. Straight or Bent Filaments. 

 Bacillus Anthracis in Anthrax. 



" of Malignant (Edema in Horse. 



" " Glanders. 



" " Tuberculosis. 



" " Septicaemia. 



" " Swine Plague. 



" " Carious Teeth. 



" " Leprosy. 



Vibrio. Linear, Wavy, Flexible Filament. 

 Vibrio of Emphysematous Anthrax (Black quarter). 

 " " Cholera (Comma Bacillus, Koch). 



Spirillum. Spiral, Rigid Filament. 

 Spirillum of Relapsing Fever of Horse (" Surrse "). 

 " " Milk-sickness. 



" " Gums and Teeth (Spirochsete Cohni). 



EENDEEKTG AITIMALS BSTSUSCEPTIBLE TO A PLAGTTE. 



So much has been done of late in the direction of pro- 

 tecting the individual animal against a contagious disease 

 by reducing its susceptibility thereunto, that it seems needful 

 to furnish a short general statement of the various processes 

 adopted to secure this, and their explanation. 



Direct Cause of Acquired Immunity. It has long been 

 well known that for a certain class of contagious diseases a 

 first attack protects its victim for many years, or even for 

 a lifetime, against a second. This knowledge was availed 

 of in inoculating exposed animals with virulent matter from 

 a mild case of a dangerous disease (small-pox, sheep-pox), 



