▁argued ▁for ▁a ▁natural istic ▁theory ▁of ▁value ▁and ▁a ▁New ▁Real ist ▁theory ▁of ▁per ception ▁and ▁knowledge . ▁He ▁wrote ▁a ▁celebrated ▁bi ography ▁of ▁William ▁James , ▁which ▁won ▁the ▁ 1 9 3 6 ▁Pul itzer ▁Prize ▁for ▁Biography ▁or ▁Aut obi ography , ▁and ▁proceeded ▁to ▁a ▁revision ▁of ▁his ▁critical ▁approach ▁to ▁natural ▁knowledge . ▁An ▁active ▁member ▁among ▁a ▁group ▁of ▁American ▁New ▁Real ist ▁philosoph ers , ▁he ▁elabor ated ▁around ▁ 1 9 1 0 ▁the ▁program ▁of ▁new ▁real ism . ▁However , ▁he ▁soon ▁diss ented ▁from ▁moral ▁and ▁spiritual ▁ont ology , ▁and ▁turned ▁to ▁a ▁philosophy ▁of ▁dis ill usion ment . ▁Perry ▁was ▁an ▁advoc ate ▁of ▁a ▁milit ant ▁dem ocracy : ▁in ▁his ▁words ▁" total ▁but ▁not ▁total itar ian ". ▁Pur itan ism ▁and ▁Dem ocracy ▁( 1 9 4 4 ) ▁is ▁a ▁famous ▁w art ime ▁attempt ▁to ▁recon cile ▁two ▁fundamental ▁concepts ▁in ▁the ▁orig ins ▁of ▁modern ▁America . ▁Between ▁ 1 9 4 6 ▁and ▁ 1 9 4 8 , ▁he ▁delivered ▁in ▁Glasgow ▁his ▁G iff ord ▁L ect ures , ▁titled ▁Real ms ▁of ▁Value . ▁ ▁He ▁married ▁Rach el ▁Ber enson , ▁and ▁they ▁lived ▁in ▁Cambridge , ▁Massachusetts . ▁Their ▁son ▁was ▁Edward ▁Bart on ▁Perry ▁born ▁at ▁their ▁home ▁ 5 ▁Av on ▁Street ▁in ▁Cambridge , ▁ 2 7 ▁September ▁ 1 9 0 6 . ▁In ▁ 1 9 3 2