div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Dr W O Howarth src=https:reader031fdocumentsinreader031viewer2022012314575068291a28ab0f07aee377html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1964 Nature Publishing Grouppdiv