PT - JOURNAL ARTICLE ED - , TI - Miscellaneous Publications AID - 10.1126/science.121.3142.393-a DP - 1955 Mar 18 TA - Science PG - 393--393 VI - 121 IP - 3142 4099 - http://science.sciencemag.org/content/121/3142/393.2.short 4100 - http://science.sciencemag.org/content/121/3142/393.2.full SO - Science1955 Mar 18; 121