▁by ▁acquired ▁characteristics . ▁In ▁June ▁he ▁went ▁on ▁a ▁walking ▁tour ▁in ▁North ▁Wales . ▁ ▁L amar ck ian ▁an atom y ▁In ▁his ▁second ▁year ▁Charles ▁became ▁active ▁in ▁student ▁soci eties ▁for ▁natural ists . ▁The ▁ 2 1 - year - old ▁radical ▁dem agog ue ▁William ▁A . ▁F . ▁Brow ne ▁and ▁the ▁ 1 9 - year - old ▁John ▁Cold stream ▁both ▁proposed ▁Dar win ▁for ▁membership ▁of ▁the ▁Pl in ian ▁Society ▁on ▁ 2 1 ▁November ▁ 1 8 2 6 . ▁ ▁John ▁Cold stream ▁came ▁from ▁an ▁evangel ical ▁background ▁and ▁shared ▁Dar win ' s ▁fasc ination ▁with ▁sea ▁life . ▁ ▁Dar win ▁was ▁elected ▁to ▁its ▁Council ▁on ▁ 5 ▁December , ▁and ▁at ▁the ▁same ▁meeting ▁Brow ne ▁presented ▁an ▁attack ▁on ▁Charles ▁Bell ' s ▁An atom y ▁and ▁Phys i ology ▁of ▁Expression ▁( which ▁in ▁ 1 8 7 2 ▁Dar win ▁would ▁target ▁in ▁The ▁Expression ▁of ▁the ▁Em ot ions ▁in ▁Man ▁and ▁Anim als ). ▁ ▁Dar win ▁became ▁a ▁keen ▁student ▁of ▁Robert ▁Ed mond ▁Grant , ▁a ▁L amar ck ian ▁an atom ist . ▁Grant ▁had ▁c ited ▁Er as mus ▁Dar win ▁in ▁his ▁doctor al ▁th esis ▁and ▁shared ▁the ▁evolution ist ▁ideas ▁of ▁Ét ienne ▁Geoff roy ▁Saint - H ila ire ▁on ▁evolution ▁by ▁acquired ▁characteristics . ▁Charles ▁joined ▁Grant ▁in ▁pione ering ▁investig ations ▁of ▁the ▁life ▁cycle ▁of ▁marine ▁in verte