RABIES 391 
tracted 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 deter- 
mined by Peuch. His table with the addition of percentages is 
appended. 
PERIOD OF INCUBATION OF RABIES IN THE DOG 
ag crea eee a Per cent 
5to 10 3 2.08 
10to 15 8 5.55 
15to 20 13 9.03 
20to 25 25 17.36 
25to 30 13 9.03 
30 to 35 25 17.36 
35to 40 6 4.17 
40 to 45 11 7.64 
45 to 50 9 6.25 
50to 55 4 2.78 
55 to 60 2 1.39 
60 to 65 7 4.86 
65to 70 1 69 
70to 75 5 3.47 
80to 90 7 4.86 
100 to 120 4 2.78 
365 1 69 
otal. dein ova 144 
The somewhat popular opinion that most of the cases of rabies 
occur in the summer, especially in “dog days,” is not well founded. 
Rabid dogs are nearly, if not quite, as numerous in spring, fall and 
winter asin summer. Salmon collected 14,066 cases of rabies in dogs 
with the months in which the disease occurred. The results are 
exceedingly interesting as the appended table shows. 
Symptoms. Rabies is generally divided into two forms, furious 
and dumb. In the first the animal is irritable, aggressive and bites 
nearly every object which eomes in its way; in the second the muscles 
of its jaws are paralyzed almost from the beginning and being unable 
to bite the animal remains more quiet and tranquil. Essentially the 
two forms of the disease are the same, but, probably~owing to the 
