Oriffinal Faccine Pock Institution. 81 



LTTEUARV AND PHILOSOPHICAL SOCIETV, NEWCASTLE 

 UPON TVNE, 



This society, in its twelfth year's report, has published 

 a resolution whicli, if adopted by other institutions, might 

 be productive of mutual advantage. The following is the 

 resolution to which we allude : 



" Tliat the subscribers to the public library at North 

 Shields (and to other similar institutions which shall afford 

 an equal accommodation to the members of the Newcastle 

 Society) shall be admitted to the rooms without introduc- 

 tion, on producing to the librarian a certificate of their being 

 members of such institutions," 



' ORIGINAL VACCINE POCK INSTITUTION. 



The following statement was entered by Dr. Pearson on 

 Friday Septeml)er 27th : 



1. That the human animal oeconomy and the animal 

 (Economy of cows are capable of undergoing the vaccina 

 once only. 



2. That the human animal oeconomy is, according to 

 the most accurate evidence, capable of undergoing small 

 pox once onlv. 



3. That the animal oeconomy of cows is unsusceptible of 

 the small pox. 



4. That the human animal is incapable of taking the 

 small pox subsequently to the cow-pock. 



The preceding propositions are only to serve as a founda- 

 tion for reasoning conjointly with the following proposi- 

 tions. 



5. Observations contained in our registered cases show, 

 that the change efiected in the hiniian animal oeconomy by 

 undergoina the cow-pock or small pox, which renders 

 it unsusceptible of either of these disorders a second time, 

 is not wrought in a moment, as if froni an impulse, but it 

 is gradually produced during several days. 



T/ie duration of the agency of the vaccine or variolous 

 matter in producing this unsusceptibility seems to he com- 

 monly three or four days. 



It scarcely or perhaps never commences earlier than the 

 Bth day after inoculation, nor later than the li-'th, unless 

 some counteracting .igent or circunjstance suspend or im- 

 pede the action of either of the two morbid niatters. Of 

 course the duration of the agency of them is for about four 

 days successively, from the 8th, Qth, loth, I 1th, and per- 

 haps the 1 2th. For brevity and distinction, the time during 

 which tilt state of unsusceptiliility is etleclcd may be called 



Vol. 23. No. 89. Oct. 1805. F the 



