Correspondence to Bateson during Backhouse's periods of work in Argentina. He discusses the progress of his scientific investigations, chiefly of wheat, and also gives general details of his experiences and observations while in Argentina. Included are photographs sent by Backhouse as follows: at K.2, 15 showing, variously, some colleagues of his (J. Williamson and H. Amos), scenes from his working environment, and general scenes of Argentina; at K.4, 4 showing wheat and rye. Most have been annotated on the back by Backhouse, often with detailed notes.

Correspondence to Bateson, chiefly re Biffen's experiments on wheats.

Contents of three envelopes labelled 'Cereals'. This arrangement was created during earlier work on the collection and has been retained.

Bateson's correspondence with Engledow, 1925, is brief and consists of his comments on three papers on wheat by Engledow, with the latter's reply.

Contains pencil notes in Bateson's hand. Topics include barley, cotton, oats, peas and wheat. There are also occasional notes relating to meetings and recording information on scientific organisations visited. A note 'New York arrived 24.9.02 Hotel Lafayette' is inscribed inside the front cover.

Contains pencil notes in Bateson's hand, chiefly on various bird species, and also on insects, wheat etc. A few sketches are included. Paginated '1-174'.

Correspondence to Bateson from various individuals including R.H. Biffen, E. Baur and E. Gold (Meteorological Office), with several pages of enclosed data and notes. Some letters and pages of notes are in German.

Correspondence from Vilmorin to Bateson, 1909, 1910, is principally on wheat varieties (also reference to Samuel Butler's books); one photocopy only of a letter from de Vries to Bateson, 1913, re Bateson's published Silliman lectures and 'Problems of Genetics' etc.

Pocket notebook, title on cover, containing notes in Bateson's hand (mostly pencil) on plant breeding, including acacia and wheat. The connection with a member of the de Vilmorin family is unclear.