1 8 4 7 , ▁partly ▁to ▁reach ▁cons ensus ▁with ▁the ▁so - called ▁modern ▁Vienna ▁School ▁that ▁emphas ized ▁active ▁obst et rical ▁inter vention ▁by ▁do ctors , ▁partly ▁to ▁study ▁the ▁work ▁of ▁Johann ▁Lucas ▁Bo ë r ▁who ▁represented ▁a ▁more ▁conserv ative ▁tr end ▁in ▁obst et rics . ▁ ▁There ▁he ▁met ▁Ign az ▁Sem mel weis ▁whose ▁theories ▁he ▁could ▁not ▁accept ▁at ▁all . ▁ ▁In sp ired ▁by ▁the ▁work ▁of ▁James ▁Young ▁Sim pson , ▁Von ▁Sie bold ▁introduced ▁the ▁use ▁of ▁ ether ▁as ▁a ▁general ▁an a est h etic ▁and ▁was ▁the ▁first ▁to ▁carry ▁out ▁a ▁ca es arian ▁section ▁using ▁this ▁subst ance . ▁ ▁Von ▁Sie bold ▁died ▁on ▁ 2 7 ▁October ▁ 1 8 6 1 ▁in ▁Gött ingen . ▁He ▁was ▁succeeded ▁by ▁Jakob ▁Heinrich ▁Hermann ▁Schw art z , ▁who ▁was ▁a ▁student ▁of ▁Gustav ▁Adolf ▁Michael is ▁and ▁an ▁assistant ▁under ▁Carl ▁Con rad ▁The odor ▁L itz mann ▁at ▁the ▁University ▁of ▁K iel . ▁ ▁Bibli ography ▁Vers uch ▁einer ▁Geschichte ▁der ▁Geb urt sh ül fe ▁ 1 8 3 9 , ▁ 1 8 4 5 ▁ ▁References ▁ ▁This ▁article ▁is ▁based ▁on ▁the ▁German ▁w iki ▁page ▁merged ▁with ▁info ▁from ▁the ▁Swedish ▁w iki ▁page ▁( both ▁version ▁ 2 0 0 8 - 0 9 - 0 4 ) ▁and ▁info ▁from ▁the ▁Johann ▁Lucas ▁Bo ë r ▁page . ▁▁ ▁( Note