Contains quinquennial research reports from the Institute of Animal Genetics, reports from the East African Trypanosomiasis Research Organisation, Department of Genetics at Cold Spring Harbor, Royal Society, Institute of Genetics, University of Pisa, National Institute of Genetics, Japan and Department of Genetics, Carnegie Institution of Washington. Also includes some catalogues, articles and reprints.

The Correspondence of Sir Archibald Geikie: Australian and New Zealand geologists sub-series consists of:

The Correspondence of Sir Archibald Geikie: Canadian geologists sub-series consists of:

Marshall writes that he is sending copies of Ewart's obituary notice which he wrote for the Royal Society. He hopes that Mrs Ewart does not mind him including some lines from her letters in the piece.

Harrison writes that he has the permission of the President of the Royal Society in giving back to Ewart the plates of his paper on the Ancestors of Horses. He is also sending Ewart a copy of the paper itself on loan.