▁mixture ▁of ▁e ugen ics ▁and ▁a ▁new ▁religion ▁of ▁his ▁de vis ing ▁which ▁he ▁eventually ▁named ▁Bey ond ism ▁and ▁proposed ▁as ▁" a ▁new ▁mor ality ▁from ▁science ". ▁▁ ▁C att ell ▁claimed ▁that ▁a ▁divers ity ▁of ▁cultural ▁groups ▁was ▁necessary ▁to ▁allow ▁that ▁evolution . ▁C att ell ▁spec ulated ▁about ▁natural ▁selection ▁based ▁on ▁both ▁the ▁separation ▁of ▁groups ▁and ▁also ▁the ▁restriction ▁of ▁" external " ▁assistance ▁to ▁" fail ing " ▁groups ▁from ▁" success ful " ▁ones . ▁This ▁included ▁advoc ating ▁for ▁" ed uc ational ▁and ▁volunt ary ▁birth ▁control ▁measures " — i . e ., ▁by ▁separ ating ▁groups ▁and ▁limit ing ▁excess ive ▁growth ▁of ▁failing ▁groups . ▁John ▁Gill is , ▁bi ograph er ▁of ▁C att ell ▁has ▁argued ▁that , ▁although ▁some ▁of ▁C att ell ' s ▁views ▁are ▁controvers ial , ▁T ucker ▁and ▁Me h ler ▁have ▁ex agger ated ▁and ▁mis re present ed ▁his ▁views ▁by ▁taking ▁quotes ▁out ▁of ▁context , ▁and ▁by ▁referring ▁back ▁to ▁out dated ▁writ ings . ▁Mag ri eth a ▁Lot z ▁( 2 0 0 8 , ▁p .   1 3 6 ) ▁also ▁says ▁he ▁was ▁taken ▁out ▁of ▁context ▁by ▁his ▁critics . ▁Lot z ▁says ▁" the ▁views ▁he ▁developed ▁in ▁the ▁ 1 9 3 0 s ▁were ▁common ▁among ▁his ▁contempor aries ▁when ▁belief s ▁in ▁ra cial ▁differences ▁were ▁widely ▁held , ▁and ▁should ▁not ▁be