316 DISEASES SECT. XXXIH. 2. 10- 



three or four fuch pun&ures 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 fubcuticular difcoloration, with rather a 

 livid appearance, without forenefs or pain, was vifible in them 

 all, as well as in my own hand. 15. The difcoloration fome- 

 what lefs, without pain or forenefs. Some patients inoculated 

 on the fame day with variolous matter have confiderable inflame 

 mation. 1 7. 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 1 8th, with variolous matter, which 

 produces the difeafe in them all." 



Mr. Power afterwards obferves, that, as the patients from 

 whom the blood was taken had the difeafe mildly, it may be 

 fuppofed, that though the contagious matter might be mixed 

 with the blood, it might dill be in too dilute a ftate to convey 

 the infeclion ; but adds at the fame time, that he has diluted 

 recent matter with at lead five times its quantity of water, and 

 which has ftill given the infection 5 though he has fometimes 

 diluted it fo far as to fail. 



The following experiments were inflituted at my requeft by 

 my friend Mr. Hadley, furgeon in Derby, to afcertain whether 

 the blood of a perfon in the fmall-pox be capable of communi- 

 eating the difeafe. "Experiment i ft, October i8th, 1793. * 

 took fome blood from a vein in the arm of a perfon who had 

 the fmali-poxj on the fecond day of the eruption, and introdu- 

 ced a fmall quantity of it immediately with the point of a lancet 

 between the fcarf and true fkin of the right arm of a boy nine 

 years old in two or three different places ; the other arm was 

 Inoculated with variolous matter at the fame time. 



" ipth. The punctured parts of the right arm were furround- 

 ed with fome degree of fubcuticular inflammation. 2oth The 

 inflammation more confiderable, with a flight degree of itching, 

 but no pain upon preflure. 21 ft. Upon examining the arm 

 this day with a lens, I found the inflammation lefs extenfive, 

 and the rednefs changing to a deep yellow or orange -colour. 

 22d. Inflammation nearly gone. 23d. Nothing remained, except 

 a flight difcoloration and a little fcurfy appearance on the punc- 

 tures. At the fame time the inflammation of the arm inoculated 

 with variolous matter was increafing faft, and he had the difeafe 

 mildly at the ufual time. 



Experiment 2d. I inoculated another child at the fame 

 time and in the fame manner, with blood taken on the firft day 

 of the eruption ; but as the appearance and effedi were fimilar 



to 



