who had the Small Pox during Pregnancy . 135 
neum , See. had eruptions upon them or not, and ne- 
ver finding any in any of thofe cavities, I began to 
fufpect, that either the fkin itfelf was the only part of 
the body fufceptible of fuch a Jlimulus\ or that the ikin 
was fubjecl to fome influence to which the other parts of 
the body were not fubjecSt, and which made it alone fufcep- 
tible of the variolous Jlimulus. If from the firft caufe,Ithen 
concluded it mull be an original principle in the animal 
ceconomy. If from the fecond, I then fufpe<fted, that ex- 
ternal expofure was the caufe; and I was the more led 
into this idea, from finding that thefe eruptions often at- 
tack the mouth and throat, two expofed parts ; add 
to which, that we generally find the eruptions moft on the 
expofed parts of the body, as the face, &c. 
With thefe ideas in my mind, I thought I faw the 
moft favourable opportunity of clearing up this point. 
I therefore very attentively examined moft of the inter- 
nal cavities of this child; fuch as the peritoneum^ pleura , 
trachea , infide of the cefophagus , ftomach, inteftines, 8ec. 
but obferved nothing uncommon. I have already ob- 
ferved, that in this child the face and extremities were 
the fulleft, fimilar to what happens in common; from 
all which I may be allowed to draw this conclufion, that 
the fkin is the principal part which is fufceptible of the 
variolous 
