PERIOD OF INCUBATION 



311 



In dogs, 21 to 40 da3^s. 



lu horses, 28 to 56 days. 



In cows, 28 to 56 da^'S. 



In cats, 14 to 28 days. 



In pigs, 14 to 21 days. 



In goats and sheep, 21 to 28 days. 



In birds, 14 to 40 days. 



In rabbits inoculated subdurally with the brain from rabid 

 animals, the writer has found the period of incubation to vary 

 from 12 to 62 days and the duration of the disease to range 

 from a few hours to three days. Wesbrook reports a period of 

 incubation in rabbits to extend in one case over a hundred 

 days. In the disease as it is naturally contracted from the 

 bites of rabid animals, the period of incubation varies with 

 reference to the location and extent of the bites. If the indi- 

 vidual is bitten about the head the period of incubation is 

 much shorter than if the injuries are on the extremities. 



In the dog, the period of incubation in 144 cases was 

 clearly determined by Peuch. His table with the addition of 

 percentages is appended. 



PERIOD OF INCUBATION OF RABIES IN THE DOG. 



