▁and ▁the ▁American ▁amb assador ▁Benjamin ▁Franklin . ▁ ▁The ▁commission ▁conducted ▁a ▁series ▁of ▁experiments ▁aim ed ▁not ▁at ▁determ ining ▁whether ▁Mes mer ' s ▁treatment ▁worked , ▁but ▁whether ▁he ▁had ▁discovered ▁a ▁new ▁physical ▁fluid . ▁The ▁commission ▁concluded ▁that ▁there ▁was ▁no ▁evidence ▁for ▁such ▁a ▁fluid . ▁Wh atever ▁benefit ▁the ▁treatment ▁produced ▁was ▁attributed ▁to ▁" im ag ination ." ▁But ▁one ▁of ▁the ▁commission ers , ▁the ▁botan ist ▁Antoine ▁Laurent ▁de ▁J uss ieu ▁took ▁exception ▁to ▁the ▁official ▁reports . ▁He ▁wrote ▁a ▁diss ent ing ▁opinion ▁that ▁declared ▁Mes mer ' s ▁theory ▁cred ible ▁and ▁worthy ▁of ▁further ▁investigation . ▁ ▁The ▁commission ▁did ▁not ▁examine ▁Mes mer , ▁but ▁investig ated ▁the ▁practice ▁of ▁d ' E sl on . ▁ ▁In ▁August ▁ 1 7 8 4 ▁Mes mer ▁visited ▁a ▁Mes mer ic ▁society ▁in ▁Lyon . ▁In ▁ 1 7 8 5 ▁Mes mer ▁left ▁Paris . ▁In ▁ 1 7 9 0 ▁he ▁was ▁in ▁Vienna ▁again ▁to ▁sett le ▁the ▁estate ▁of ▁his ▁dece ased ▁wife ▁Maria ▁Anna . ▁When ▁he ▁sold ▁his ▁house ▁in ▁Vienna ▁in ▁ 1 8 0 1 ▁he ▁was ▁in ▁Paris . ▁ ▁Mes mer ▁was ▁driven ▁into ▁ex ile ▁soon ▁after ▁the ▁investig ations ▁on ▁animal ▁magnet ism ▁although ▁his ▁influ ential ▁student , ▁Arm and - Marie - Jac ques ▁de ▁Ch ast en et , ▁Mar quis ▁de ▁P us ég ur ▁( 1 7 5 1