Notes by Lack and others, typescript of various tables, comments on the manuscripts, correspondence.

Notes and observations, corrected manuscripts, comments on Chapter 13 signed 'J.W. Jan '65' (John Warham), correspondence.

Notes, bibliographies, correspondence.

Notes and correspondence.

Data, notes on others' work, offprints (in German), correspondence.

Graphs, notes and calculations mainly on egg data (weight, incubation, size), correspondence.

Notes, corrected manuscripts and graphs, correspondence.

Notes and data by Lack and others, corrected typescript of various tables, correspondence (with much additional data).

Notes, typescript of 'The Phylogeny of the Parasitic Icteridae' with comments by Mayr and Paynter and corrected typescript of 'Mimicry in parasitic young'.