div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Sir Patrick Laidlaw FRS src=https:reader035vdocumentssitereader035viewer2022081823575067e11a28ab0f07ad9368html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1940 Nature Publishing Grouppdiv