st aking ly ▁ear ns ▁the ▁nerv ous ▁dog ' s ▁trust ▁with ▁food ▁and ▁brings ▁it ▁into ▁the ▁home . ▁Despite ▁his ▁efforts , ▁the ▁sick ly ▁dog ▁dies ▁a ▁week ▁later , ▁and ▁Ne ville , ▁ro bb ed ▁of ▁all ▁hope , ▁res igned ly ▁returns ▁to ▁learning ▁more ▁about ▁the ▁v amp ires . ▁ ▁Ne ville ' s ▁continued ▁read ings ▁and ▁experiments ▁on ▁in cap ac itated ▁v amp ires ▁help ▁him ▁create ▁new ▁theories . ▁He ▁bel ieves ▁v amp ires ▁are ▁affected ▁by ▁mirror s ▁and ▁cross es ▁because ▁of ▁" h yst er ical ▁blind ness ", ▁the ▁result ▁of ▁previous ▁psych ological ▁condition ing ▁of ▁the ▁inf ected . ▁D ri ven ▁ins ane ▁by ▁the ▁disease , ▁the ▁inf ected ▁now ▁react ▁as ▁they ▁believe ▁they ▁should ▁when ▁confront ed ▁with ▁these ▁items . ▁Even ▁then , ▁their ▁reaction ▁is ▁const rained ▁to ▁the ▁belief s ▁of ▁the ▁particular ▁person ; ▁for ▁example , ▁a ▁Christian ▁v amp ire ▁would ▁fear ▁the ▁cross , ▁but ▁a ▁Jewish ▁v amp ire ▁would ▁not . ▁Ne ville ▁addition ally ▁disco vers ▁more ▁efficient ▁means ▁of ▁killing ▁the ▁v amp ires , ▁other ▁than ▁just ▁driving ▁a ▁st ake ▁into ▁their ▁hearts . ▁This ▁includes ▁expos ing ▁v amp ires ▁to ▁direct ▁sun light ▁or ▁inf lic ting ▁wide , ▁o xygen - ex pos ing ▁w ounds ▁anywhere ▁on ▁their ▁bodies ▁so ▁that ▁the ▁b acter ia ▁switch ▁from ▁being ▁an a er ob