in the inoculated Vaccine Difeafe. 317 
tf this fhould be found to be the cafe by future experiments, 
- {till we mutt confider the two potions as of diftin&tly different 
fpecies, on account of the different characters of the puftule 
‘in the fmal]-pox and cow-pox; although, as juft faid, by the 
combination of fome other fubftance with the cow-pox poi- 
fon, or by the feparation of fome one of the conftituent in- 
gredients of this poifon, the variolous poifon may be pro- 
duced. To illuftrate this theory let it be confidered, that 
magnefia and fulphate of magnefia are different fpecies of 
fubflances ; although they agree in fome of their principal 
effects on the human conftitution, and in other properties ; 
but, by the union of magnefia with fulphuric acid, it becomes 
fulphate of magnefia. Or the illuftration may be given con- 
verfely. As, then, we have diftin@ denominations for thefe 
two fubftances, fo we ought to have them for the two poi- 
fons, and the two different difeafed {tates they produce, name- 
ly, the cow-pox and the fmall-pock. Accordingly, Dr. Odier, 
of Geneva, whofe powers as a Dialectician, and whofe acute- 
nefs as a Philologer, ‘I can atteft from the period of his aca- 
demical ftudies, has ‘ baptifed”? (to pfe the language of Dr. 
De Carro,) the new difeafe La Vaccine, or Vaccina, rejecting 
the abfurd name of the Englith, variole vaccine. 
But, to return to the immediate queftion under difcuffion, 
granting that eruptions are liable to be produced by the ino- 
culation of the cow-pock, what difference ought this accident 
to make in our eftimate of the value of the new practice, 
from the eftimate on the fuppofition that no fuch cruptions 
would occur? I apprehend the value is hereby depreciated, 
- 
but not to fuch a degree as to create any reafonable apprehen- 
fions of the failure of the Vaccine Inoculation in fuperfeding 
and extinguifhing the fmall-pox. Becaufe, 
mee Tt. the precaution be taken of avoiding the ‘adiularias 
with matter from eruptive cafes, as far as T have feen, not 
above one cafe, with variolous-like eruptions, will be pro- 
duced among 200 inftances of inoculated cow- pox. 
2. Thefe eruptive cafes are, as far as I have obferved, like 
the ordinary kinds of inoculated fmall-pox. 
3. I have feen no disfigurations of the fkin from this va- 
. el of cow-pox; but I think it jut to acknowledge that, 
from 
