448 Mifcellaneous Obfervations on 
origin could not be traced to a bite, or any 
other mode of infection, from a rabid animal. 
I. It 
ation in the falivary glands, and thereby effets a change 
in their fecretions; at leaft, this change takes place in the 
canine race.—But, there is no proof of fuch an affimila- 
tion of the faliva occurring in any inftance of hydropho- 
bia, arifing fpontancoufly, or excited by any other caufe 
than that of the poifon of a mad animal, Therefore, as 
we know that a variety of ftimulant powers are capable 
of producing effe&ts analogous to thofe excited by the canine 
virus, it is more confiftent with the rules of juft indu€tion, 
to attribute the fymptoms of fpontaneous hydrophobia to 
the operation of thefe powers, than to have recourfe to 
the vague conjectural idea of their being produced by a 
{pecific poifon, generated in the body. Nofologifts have 
confidered fpontaneous hydrophobia, as a /pecies of the 
Genus Hypropuosta; but their definitions are inaccurate— 
It is the Hy pRoruosta fimplex of Dr. Cullen, andis defined: 
Hy propuosia (jimplex ) fine rabie vel mordendi cupiditate,"’ 
in contradiftin@ion to the firft fpecies, which he defcribes 
to be: “ Hy prorxosia (rabiofa) cum mordendi cupiditate, 
ex morfu animalis rabidi.” The fecond {pecies of Cullen 
correfponds with the Hypropnosia /pontanea of Sau- 
vages, as his firft agrees with the Hyprornosia vulgaris 
of the fame author, Thefe definitions do not reft upon 
fa&ts. For, fo far is the “cupiditas mordendi” from be- 
ing an effential fymptom in the Hyproruosia rabiofa, 
that it very rarely occurs in that difeafe—On the con- 
trary, this fymptom has taken place in feveral cafes of 
the Hyproenosia fimplex or {fpontaneous Hydrophobia, 
related in the courfe of this enquiry; but, it by no means 
feems to be an effential fymptom of the difeafe, in cither 
{pecies, 
