UTILIZATION OF ANIMALS FOR BACTERIA 
269 
7. For the production of various antibodies, as antitoxins, agglu- 
tinins, precipitins and lysins. 
The choice of animals depends chiefly upon the nature of the obser- 
vation to be made. Rabbits, guinea-pigs, white rats and mice, dogs 
and cats are more commonh' made use of for these various examina- 
FiG. 35.— Guinea-pig dissertion to show anatomical relations of internal organs and 
important lymph glands. (From Eyre, Bacteriological Technic, Saunders & Co.) 
tions. The method and site of inocuhation, as well as the dosage, 
may influence the course of the infecticm. 
The Inoculation of Animals.— Animals may be inoculated through 
natural channels, as by inhalation into the respiratory tract, or inges- 
tion into the alimentary tract. INIore frequently, however, material is 
