, 
oe 
Canine &3 Spontaneous Hydrophotia. 473 
have produced all the pathognomonic fymptoms 
of canine madnefs; and finally, that violent 
alternations of heat and cold, and all other 
caufes, which induce great debility, and at the 
fame time increafe the irritability ot the fyftem, 
have at times proved adequate to the produc- 
tion of fymptoms, exactly correfponding with 
thofe of Rabies Canina. Perhaps the following 
obfervations may tend to elucidate, more fully, 
the propriety of adopting the above inferences. 
I. I conjecture that thofe writers who no- 
ticed the occurrence of canine madnefs at the 
diftance of feven, twenty, and even forty years, 
from the fuppofed communication of the virus, 
have either been miftaken, in confidering the 
anomalous fymptom of an inability to {wallow 
fluids, which is fometimes met with in fever, 
hyfteria, and other difeafes, as an effect of the 
animal poifon; or have been ignorant that 
Hydrophobia has occurred in particular habits, 
without the poffibility of aflgning any fpecific 
caufe for its production. Moreover, it is a fact 
founded on the obfervation of a confiderable 
number of cafes, that upon the average, not 
‘more than one* perfon, out of twenty-five who 
Nnon : have 
* Sce Hamitton’s Treatile on NHydrophobia; Dr, 
Vaucuan’s “ Two Cafes of Canine Madnefs;” and Dr. 
Huwrter’s Paper on this fubjeft in the Tranfattions already 
quoted, 
