▁his ▁former ▁patron ▁by ▁including ▁a ▁com edic ▁reference ▁to ▁Mes mer ▁in ▁his ▁opera ▁Cos ì ▁fan ▁tutte . ▁ ▁Animal ▁magnet ism ▁ ▁In ▁ 1 7 7 4 , ▁Mes mer ▁produced ▁an ▁" art ific ial ▁t ide " ▁in ▁a ▁patient , ▁Francis ca ▁Ö ster lin , ▁who ▁suffered ▁from ▁h yst eria , ▁by ▁having ▁her ▁sw allow ▁a ▁prepar ation ▁containing ▁iron ▁and ▁then ▁att aching ▁magnet s ▁to ▁various ▁parts ▁of ▁her ▁body . ▁She ▁reported ▁feeling ▁streams ▁of ▁a ▁myster ious ▁fluid ▁running ▁through ▁her ▁body ▁and ▁was ▁rel ieved ▁of ▁her ▁sympt oms ▁for ▁several ▁hours . ▁Mes mer ▁did ▁not ▁believe ▁that ▁the ▁magnet s ▁had ▁achieved ▁the ▁c ure ▁on ▁their ▁own . ▁He ▁felt ▁that ▁he ▁had ▁contributed ▁animal ▁magnet ism , ▁which ▁had ▁accum ulated ▁in ▁his ▁work , ▁to ▁her . ▁He ▁soon ▁stopped ▁using ▁magnet s ▁as ▁a ▁part ▁of ▁his ▁treatment . ▁ ▁In ▁the ▁same ▁year ▁Mes mer ▁collabor ated ▁with ▁Maxim ilian ▁Hell . ▁ ▁In ▁ 1 7 7 5 , ▁Mes mer ▁was ▁invited ▁to ▁give ▁his ▁opinion ▁before ▁the ▁Mun ich ▁Academy ▁of ▁Sciences ▁on ▁the ▁ex or cis ms ▁carried ▁out ▁by ▁Johann ▁Joseph ▁G ass ner ▁( G a ß ner ), ▁a ▁priest ▁and ▁he aler ▁who ▁grew ▁up ▁in ▁Vor ar l berg , ▁Austria . ▁Mes mer ▁said ▁that ▁while ▁G ass ner ▁was ▁s inc ere ▁in ▁his ▁belief s , ▁his ▁c ures