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.

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

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.