PT - JOURNAL ARTICLE ED - , TI - SCIENTIFIC NOTES AND NEWS AID - 10.1126/science.52.1337.151 DP - 1920 Aug 13 TA - Science PG - 151--153 VI - 52 IP - 1337 4099 - http://science.sciencemag.org/content/52/1337/151.short 4100 - http://science.sciencemag.org/content/52/1337/151.full SO - Science1920 Aug 13; 52