▁Dr . ▁( ?) ▁Gray ; ▁John ▁Gill ies . ▁ ▁Pear son ▁and ▁Small po x ▁V acc ination ▁Pear son ▁was ▁a ▁very ▁early ▁advoc ate ▁of ▁small po x ▁v acc ination ▁and ▁supp orter ▁of ▁Edward ▁Jen ner ▁and ▁published ▁his ▁early ▁observations ▁within ▁months ▁of ▁the ▁publication ▁of ▁Jen ner ' s ▁In qu iry . ▁Early ▁in ▁ 1 7 9 9 ▁he ▁helped ▁to ▁set ▁up ▁the ▁Original ▁V acc ine ▁P ock ▁Institute ▁in ▁London ▁and ▁started ▁to ▁dist ribute ▁v acc ine , ▁some ▁samples ▁of ▁which ▁were ▁cont amin ated ▁with ▁small po x ▁virus . ▁This ▁caused ▁a ▁r ift ▁with ▁Jen ner ▁who ▁thought ▁his ▁own ▁work ▁was ▁being ▁over shadow ed . ▁In ▁turn , ▁Pear son ▁became ▁en vious ▁of ▁Jen ner ' s ▁growing ▁reputation . ▁When ▁Jen ner ▁pet ition ed ▁Parliament ▁for ▁a ▁financial ▁reward ▁in ▁ 1 8 0 2 , ▁he ▁published ▁a ▁detailed ▁account ▁of ▁his ▁own ▁contribution , ▁together ▁with ▁evidence ▁that ▁Jen ner ▁did ▁not ▁discover , ▁v acc ination ▁bringing ▁attention ▁to ▁far mer ▁Benjamin ▁J esty ▁and ▁others ▁who ▁he ▁maintained ▁had ▁prior ▁claims . ▁When ▁Jen ner ▁sought ▁a ▁further ▁Parliament ary ▁grant ▁in ▁ 1 8 0 5 ▁Pear son ▁brought ▁J esty ▁to ▁London ▁to ▁visit ▁the ▁Original ▁V acc ine ▁P ock ▁Institute ▁to ▁further ▁his ▁claim ▁with ▁no ▁success . ▁By ▁this ▁time , ▁although ▁there ▁was ▁opposition ▁to ▁v acc ination ▁as ▁such