464 DISEASES OF SENSATION. SECT. XXXIII, . 



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 communicating the difeafe. 

 "Experiment lit. Oclober i8th, 1793. I took fome 

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

 the fmall-pox, on the fecond day of the eruption, 

 and introduced* 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. 



** J9th. The puuv^ured parts of the right arm 

 were furrounded with fome degree of fubcuticular 

 inflammation, soth. The inflammation more con- 

 iiderable, 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 yel- 

 low or orange-colour. 22d. Inflammation nearly 

 gone. 2jd. Nothing remained, except a flight dif- 

 coloration and a little fcurfy appearance on the 

 punlures. At the fame the inflammation of th$ 

 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 effe&s were fimilar to thofe in the 

 preceding experiment, I (hall not relate them mi* 

 nutely. -^ 



' Experiment 3d. October 2pth. Blood was 

 taken from a perfon who had the fmall-pox, on the 

 third day of the eruption, and on the fixth from the 

 commencement of the eruptive fever. I introduced 

 fome of it in its fluid flate into both arms of a boy 

 feven years old. 2ift. There appeared to be fome 



inflammation. 



