, ▁hot ter ▁blo oded ▁forms , ▁as ▁shown ▁by ▁a ▁progress ive ▁sequence ▁of ▁foss ils , ▁and ▁that ▁study ▁of ▁eggs ▁of ▁the ▁simplest ▁cre atures ▁would ▁help ▁reve al ▁mon ads , ▁elementary ▁living ▁particles . ▁While ▁this ▁showed ▁that ▁natural ists ▁could ▁try ▁to ▁" l ift ▁the ▁ve il ▁that ▁hang s ▁over ▁the ▁origin ▁and ▁progress ▁of ▁the ▁organ ic ▁world ", ▁Dar win ▁was ▁trouble d ▁by ▁Grant ' s ▁at he ism ▁and ▁could ▁see ▁that ▁trans mut ation ▁was ▁far ▁from ▁respect able . ▁Dar win ▁later ▁re called ▁" I ▁listened ▁in ▁silent ▁aston ishment , ▁and ▁as ▁far ▁as ▁I ▁can ▁judge , ▁without ▁any ▁effect ▁on ▁my ▁mind . ▁I ▁had ▁previously ▁read ▁the ▁Zo ön om ia ▁of ▁my ▁grand father , ▁in ▁which ▁similar ▁views ▁are ▁maintained , ▁but ▁without ▁producing ▁any ▁effect ▁on ▁me ." ▁ ▁Short ly ▁afterwards ▁Cold stream ▁graduated ▁and ▁went ▁to ▁Paris ▁for ▁his ▁hospital ▁study , ▁where ▁he ▁suffered ▁a ▁mental ▁break down , ▁struggling ▁with ▁" the ▁f oul ▁mass ▁of ▁cor ruption ▁within ▁my ▁own ▁bos om ", ▁held ▁capt ive ▁to ▁his ▁body ▁by ▁" cor rod ing ▁des ires " ▁and ▁" l ust ful ▁imag in ations ". ▁The ▁doctor ' s ▁report ▁was ▁that ▁though ▁Cold stream ▁had ▁led ▁" a ▁bl am eless ▁life ", ▁he ▁was ▁" more ▁or ▁less ▁in ▁the ▁dark ▁on ▁the ▁vital ▁question ▁of ▁religion , ▁and ▁was ▁trouble d ▁with