ation ▁of ▁Land ▁Mass es ', ▁and ▁the ▁remarkable ▁paper ▁' On ▁L akes ▁and ▁their ▁Origin ', ▁were ▁also ▁important ▁contributions ▁to ▁science . ▁▁ ▁Dun can ' s ▁health ▁began ▁to ▁fail ▁about ▁two ▁years ▁prior ▁to ▁his ▁death , ▁which ▁closed ▁a ▁pain ful ▁ill ness ▁on ▁ 2 8 ▁May ▁ 1 8 9 1 . ▁ ▁He ▁was ▁buried ▁in ▁Ch is wick ▁church yard . ▁ ▁Family ▁He ▁was ▁twice ▁married ▁: ▁in ▁ 1 8 5 1 ▁to ▁Jane ▁Em ily ▁Cook , ▁and ▁in ▁ 1 8 6 9 , ▁not ▁long ▁after ▁her ▁dece ase , ▁to ▁Mary ▁Jane ▁Em ily ▁L idd el ▁Whit mar sh , ▁who ▁surv ived ▁him ▁with ▁one ▁son ▁by ▁her . ▁Four ▁sons ▁and ▁seven ▁daughters ▁by ▁the ▁first ▁marriage ▁also ▁surv ived ▁him . ▁His ▁son ▁Francis ▁became ▁a ▁zo ologist , ▁writing ▁many ▁popular ▁works ▁of ▁natural ▁history ▁and ▁making ▁pione ering ▁natural ▁history ▁films ▁for ▁producer ▁Charles ▁Urban ▁in ▁the ▁ 1 9 0 0 s . ▁ ▁References ▁ ▁Att ribution ▁ ▁External ▁links ▁▁▁ ▁Category : 1 8 2 4 ▁birth s ▁Category : 1 8 9 1 ▁death s ▁Category : English ▁p ala e ont olog ists ▁Category : B rit ish ▁p ala e ont olog ists ▁Category : F ell ows ▁of ▁the ▁Royal ▁Society ▁Category : Al umn i ▁of ▁King ' s ▁College ▁London ▁Category : A cadem ics ▁of ▁King ' s ▁College ▁London ▁Category