VOL. XXXII.] PHILOSOPHICAL TRANSACTIONS. • dOQ 



very few, we sometimes observe that they do not rise to so great a bulk, neitlier 

 do they ripen so fully, nor continue so long as usual; and it is the same in the 

 way of inoculation. In short, as this distemper is raised by an ingraftment 

 from the small pox, as it has the very same appearance, and as it is capable of 

 producing the same by infection, there seems to be no room to doubt of its 

 being the true and genuine small pox. And if that be allowed, it will follow 

 from thence, as a corollary, that "Those, who have been inoculated, are in no 

 more danger of receiving the distemper again, than those who have had it in 

 the ordinary way." And this is also so far confirmed by experience. We are 

 very ready to own, that the operation may sometimes fail: those gentlemen, 

 who first communicated to the R. S. some account of this practice from Turkey, 

 did both of them intimate so much ; though I believe that will but rarely happen. 

 In one instance here, I observed no eruption at all, neither did the wounds 

 inflame and swell any more than would have followed from a common incision, 

 which made me conclude, that what was applied had not taken efl^ect, and 

 indeed the reason of it was very well known to me. In 3 others, though the 

 wounds did inflame, and swell, and discharge considerably, yet the eruptions 

 were so imperfect, as to leave me a little in doubt: but 2 of these have since 

 been sufficiently tried, by being constantly with those who had the small pox, 

 without receiving any infection ; which makes me inclined to believe they will 

 always be secure from any danger of it. As to all the rest, no one, who saw 

 them, did in the least question, but that they had the true small pox. 



As to the latter proposition, " That the ingrafted small pox is far less dan- 

 gerous than the natural :" the truth of this, I suppose, can only be found by 

 making a comparison, so far as our experience will extend. In order to this, 

 I have annexed an account taken in this and several other towns, where the small 

 pox has been epidemical this last year, how many have had the small pox, and 

 how many out of that number have died. 



Have had the 



Small Pox. Died. 



In Halifax 276 43 



In a part of the parish of Halifax, stretching towards Bradford 297 .... 59 



In another part of the same parish 268 .... 28 



In Bradford 129 36 



In Leeds 792 189 



In Wakefield 418 57 



In Rochdale 177 38 



In Ashton under Line, a small market-town in Lancashire, including 2 neigh- 

 bouring villages 279 • • • • 56 



In Macclesfield 302 37 



In Stockport 287 73 



In Hatherfield 1 80 20 



Total 3405 636 



VOL. VI. ' * ' ' 4 I 



