3 1 £ On the Vaccine Inoculation. 



grefs of the other; and consequently, as thefe two principles 

 cannot exitt together, the one cannot add to the other. 



Another very important obfervation, which appears to me 

 to prove that the vaccine is really a fpecies of the fmall-pox, 

 which differs from the human fmall-pox only by its origin 

 and the peculiar character of miklnefs by which it is diltin- 

 guilhcd, is as follows : — A. child of C. Billier, falt-refiner, on 

 the ninth day of inoculation for the vaccine, which is the 

 critical day, cut four teeth, two of them eye-teeth. A fecond 

 crilis of nature fq violent, ought to havj been, and was ac- 

 companied with, a ftrong accefs of fever, which, added to the 

 very moderate accefs arifing from the vaccine, brought out 

 on the child's body an eruption of 262 large puftules filled 

 with limpid matter. No common inoculation ever produced 

 any of fd beautiful a kind ; they ended without the leail fever, 

 and difappeared at the end of feven days without leaving any 

 marks. This child fince inoculation has enjoyed perfect 

 health; and I have remarked that is invariably the effecl: of 

 the vaccine. The cafe is far from being the fame with the 

 common inoculation. Of the children whom I inoculated 

 with the vaccine, feveral were weak and ailing, often attacked 

 with a violent cough, and two of them were waited with a 

 periodical fever. All thefe children, and in particular the 

 two laft, have enjoyed fince the operation perfect health. 



The vaccine inoculation ferves me as a criterion to diffipate 

 the uneafinefs of thoie who have need of being allured that 

 they have had the fmall-pcx, and that thev have nothing to 

 fear. 



I have offered a premium for every poor perfon who can 

 be proved to me to have had the fmall-pox after 'being ino- 

 culated, with care, for the vaccine. I fhould not be afraid 

 \o rilk my whole fortune at prefent on this head. But I 

 cannot too ftrongly recommend to practitioners to bellow 

 more care on this operation, and to repeat it if the leaft 

 doubt Ihould remain ; otherwife there will be fome danger 

 of feeing perfons attacked with the fmall-pox after being 

 fuppofed fecured from that difeafe bv the vaccine. It is to 

 errors of this kind that the obftacles oppofed to the intro T 



ducTion 



