div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Dr R S Bassler src=https:reader035vdocumentsinreader035viewer20220818105750681f1a28ab0f07aeb40ahtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1962 Nature Publishing Grouppdiv