▁b ark ▁from ▁a ▁dead ▁tree ▁and ▁caught ▁a ▁ground ▁be et le ▁in ▁each ▁hand , ▁then ▁saw ▁the ▁rare ▁Cru c if ix ▁Gr ound ▁Be et le , ▁ ▁Pan ag ae us ▁cru x major . ▁With ▁the ▁hab its ▁of ▁an ▁egg - collect or , ▁he ▁po pped ▁one ▁ground ▁be et le ▁in ▁his ▁mouth ▁to ▁free ▁his ▁hand , ▁but ▁it ▁e ject ed ▁some ▁intens ely ▁ac rid ▁fluid ▁which ▁bur nt ▁his ▁tongue ▁and ▁Dar win ▁was ▁forced ▁to ▁sp it ▁it ▁out . ▁He ▁lost ▁all ▁three . ▁The ▁spec im ens ▁he ▁did ▁not ▁lose ▁had ▁to ▁be ▁mounted ▁and ▁identified , ▁and ▁his ▁knowledge ▁from ▁Edinburgh ▁of ▁L amar ck ▁proved ▁useful . ▁Fox ▁introduced ▁him ▁for ▁advice ▁on ▁identification ▁to ▁the ▁Rev d . ▁John ▁Stevens ▁H ens low , ▁professor ▁of ▁bot any , ▁and ▁Dar win ▁began ▁att ending ▁his ▁soir ées , ▁a ▁club ▁for ▁bud ding ▁natural ists . ▁Here ▁he ▁could ▁meet ▁other ▁profess ors ▁including ▁the ▁ge ologist ▁the ▁Rev d . ▁Adam ▁Sed g wick ▁and ▁the ▁new ▁min eral og ist ▁the ▁Rev d . ▁William ▁Whe well . ▁ ▁In ▁the ▁summer ▁Dar win ▁paid ▁vis its ▁to ▁S quire ▁O wen , ▁and ▁rom ance ▁seemed ▁to ▁be ▁bl oss oming ▁with ▁the ▁s quire ' s ▁daughter ▁F anny . ▁Dar win ▁joined ▁other ▁Cambridge ▁friends ▁on ▁a ▁three - month ▁" reading ▁party " ▁at ▁Bar mouth