This material was in two separate groups and has been listed accordingly.

Contents of an envelope inscribed 'alleged mutations'. Letters by J.S. Martin (Bateson not the recipient) at D.112; notes and printed pamphlets by Martin on variations at D.112, D.113. Included also are photographs.

Brief correspondence between Hardy and Bateson, 1925, re Charles Darwin's house; correspondence from Harrison to Bateson, 1919, 1925, re studies of various flora and of melanism.