div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Prof Jan Florian src=https:reader035vdocumentsnetreader035viewer2022080107575067ec1a28ab0f07adc6c8html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1946 Nature Publishing Grouppdiv