702 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



Table 220. — Variables: Beta score X years in the United States. Groups J, II, III: White draft, foreign born. 



For men who took beta only or alpha-beta only. 



Table 221.— Variables: Performance score X years in the United States. Groups I, II, III: White draft, foreign born. 



For men who took performance scale examination only, or following beta, or following alpha, or following alpha and 



beta. 



