Correspondence to Bateson; 4pp manuscript notes in Bateson's hand. One letter (from R. Goldschmidt) is in German. Its subject, 'sex chromosome in butterfly', has been inscribed on the first page by Bateson.

Letter to Bateson from H.J. Elwes, with enclosed notes; bibliographical notes in Bateson's hand.

Brief correspondence to Bateson re pieris napi eggs; 6pp experimental data and further pages of notes, all in Bateson's hand.

9pp manuscript notes by Bateson.