On Plica Polonica. 327 
Befides the human fpecies, other animals are fub- 
jet to this complaints It appears in fome of the 
fineft horfes in Poiand. In them it is fituated in 
the mane, and fometimes in the long hairs around 
‘the hoof and fetlock joint. It attacks alfo the dif- 
ferent fpecies of the canine genus; dogs, wolves, 
and foxes. Previous to its occurrence in the firft, 
the fymptoms of rabies ufually appear: the tail 
is dropped between the hind legs, there is a flow of 
frothy faliva from the mouth, the fight and appetite 
are impaired, or entirely loft; they are fnappifh, 
and difpofed to bite, but their bite does not produce 
hydrophobia. The wolf is affeted in the fame 
manner; he leaves. his. wonted concealments in the 
woods, and rtins wildly among the flocks, biting, 
and deftroying them, but without producing bydro- 
phobia. 
The impoffibility of afcertaining the true caufes 
of this fingular difeafe, has given rife to feveral 
vague conjectures on the fubject; as that of Le 
Fontaine, who attributes it to a corruption of the 
fat. ne 
It is fomewhat remarkable, that Plica takes place 
only among the, lower clafs of people; whence fome 
have conceived, that it is to be confidered merely 
asa confequence of uncleanlinefs. 
But, in objection to this opinion, it may be 
tirged, that it is unknown in the adjoining coun- 
tries fubject to the Pruffian Government, where 
the peafants are habituated to the fame cuftoms and 
mode 
