▁the ▁idea , ▁B ly th ▁remained ▁a ▁val ued ▁correspond ent ▁and ▁friend ▁of ▁Dar win ' s ▁after ▁the ▁idea ▁was ▁published . ▁ ▁Return ▁from ▁India ▁B ly th ▁returned ▁to ▁London ▁on ▁ 9 ▁March ▁ 1 8 6 3 ▁to ▁recover ▁from ▁ill ▁health . ▁He ▁was ▁to ▁get ▁a ▁full ▁year ' s ▁pay ▁for ▁this ▁sick ▁leave . ▁He ▁however ▁had ▁to ▁borrow ▁money ▁from ▁John ▁Henry ▁G ur ney ▁and ▁continued ▁his ▁animal ▁trade . ▁ ▁Ar ound ▁ 1 8 6 5 , ▁he ▁began ▁to ▁help ▁Thomas ▁C . ▁J erd on ▁in ▁the ▁writing ▁of ▁the ▁Bird s ▁of ▁India ▁but ▁had ▁a ▁mental ▁break down ▁and ▁had ▁to ▁be ▁kept ▁in ▁a ▁private ▁as yl um . ▁He ▁was ▁a ▁corresponding ▁member ▁of ▁the ▁Zo ological ▁Society ▁and ▁was ▁elected ▁an ▁extraordinary ▁member ▁of ▁the ▁British ▁Or n ith ological ▁Union , ▁nominated ▁by ▁Alfred ▁Newton . ▁He ▁later ▁took ▁to ▁drink ing ▁and ▁was ▁once ▁held ▁for ▁assault ing ▁a ▁cab ▁driver . ▁He ▁died ▁of ▁heart ▁disease ▁in ▁December ▁ 1 8 7 3 . ▁ ▁Other ▁works ▁Although ▁B ly th ▁spent ▁most ▁of ▁his ▁time ▁in ▁the ▁museum ▁in ▁India , ▁he ▁was ▁aware ▁and ▁interested ▁in ▁the ▁study ▁of ▁birds ▁in ▁life . ▁Prior ▁to ▁moving ▁to ▁India , ▁he ▁conducted ▁some ▁experiments ▁to ▁examine ▁if ▁c uck oo ▁eggs ▁( or ▁more ▁generally ▁foreign ▁eggs ) ▁were ▁detected ▁and ▁removed ▁by ▁the ▁hosts ▁by ▁placing