div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Prof Max Verworn src=https:reader031vdocumentspubreader031viewer2022020522575067b91a28ab0f07acdb37html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1922 Nature Publishing Grouppdiv