SECT. XXXIII. s. DISEASES OF SENSATION. 463 



blood from the fame perfon, in order to compare 

 the appearances, which might arife in a perfon lia- 

 ble to receive the infection, and in one not liable to 

 receive it. On the fame day I inoculated four other 

 children liable to receive the infection with blood 

 taken from another perfon on the fourth day after 

 the commencement of the eruption. The patients 

 from whom the blood was taken had the difeafe 

 mildly, but had the moft puflules of any I could 

 felecl from twenty inoculated patients ; and as much 

 of the blood was infmuated under the cuticle as I 

 could introduce by elevating the (kin without draw- 

 ing blood ; and three or four fuch punctures 

 were made in each of their arms, and the blood 

 was ufed in its fluid ftate. 



" As the appearances in all thefe patients, as 

 well as in myfelf, were fimilar, I fhall only mention 

 them in general terms. March 13. A flight fubcu- 

 ticular difcoloration, with rather a livid appearance, 

 without forenefs or pain, was vifible in them all, 

 as well as in my own hand. 15. The difcolo ration, 

 fomewhat lefs, without pain or forenefs. Some pa- 

 tients inoculated on the fame day with vanolous 

 matter have conliderable inflammation. 17. The 

 difcoloration is quite gone in them all, and from my 

 own hand, a dry mark only remaining. And they 

 were all inoculated on the iSth, with variolous mat- 

 ter, which produced the difeafe in them all." 



Mr. Power afterwards obferves, that, as the pati- 

 ents from whom the blood was taken had the dif- 

 eafe mildly, it may be fuppofed, that though the 

 contagious matter might be mixed with the blood, 

 it might dill be in too dilute a (late to convey the 

 infection ; but adds at the fame time, that he has 

 dilute:! -recent matter with at leaf! five times its 

 quantity of water, and which has flill given the in- 

 feclion ; though he has fometimes diluted it fo far 

 as to fail. 



The 



