, ▁and ▁th ence ▁in ▁ 1 8 4 3 ▁to ▁Cal cut ta , ▁where ▁he ▁became ▁principal ▁of ▁Del hi ▁College . ▁In ▁this ▁capacity ▁he ▁had ▁many ▁text books ▁translated ▁into ▁H indust ani ▁from ▁European ▁languages . ▁ ▁In ▁ 1 8 4 8 ▁he ▁was ▁sent ▁to ▁L uck now , ▁to ▁prepare ▁a ▁catalog ue ▁of ▁the ▁royal ▁library ▁there , ▁the ▁first ▁volume ▁of ▁which ▁appeared ▁in ▁Cal cut ta ▁in ▁ 1 8 5 4 . ▁This ▁book , ▁with ▁its ▁lists ▁of ▁Pers ian ▁po ets , ▁its ▁careful ▁description ▁of ▁all ▁the ▁chief ▁works ▁of ▁Pers ian ▁poetry ▁and ▁its ▁valuable ▁bi ographical ▁material , ▁became ▁a ▁worthy ▁guide ▁for ▁the ▁expl oration ▁of ▁Pers ian ▁literature . ▁ ▁In ▁ 1 8 5 0 ▁Spr enger ▁was ▁named ▁exam iner , ▁official ▁government ▁interpreter , ▁and ▁secretary ▁of ▁the ▁A si atic ▁Society ▁of ▁Cal cut ta . ▁He ▁published ▁many ▁works ▁while ▁holding ▁this ▁latter ▁position , ▁among ▁them ▁“ Dictionary ▁of ▁the ▁Techn ical ▁terms ▁used ▁in ▁the ▁sciences ▁of ▁the ▁Mus ul mans ” ▁( 1 8 5 4 ) ▁and ▁“ I bn ▁H aj ar ' s ▁bi ographical ▁dictionary ▁of ▁persons ▁who ▁knew ▁Moh ammed ” ▁( 1 8 5 6 ). ▁ ▁Spr enger ▁took ▁a ▁position ▁as ▁professor ▁of ▁orient al ▁languages ▁at ▁the ▁University ▁of ▁Bern ▁in ▁ 1 8 5 7 , ▁moving ▁in ▁ 1 8 8 1 ▁to ▁Heidel berg