In Darlington's hand, apparently incomplete. The sequence of chapters in the draft and some of their titles have undergone considerable revision. The various distinct parts of the draft (with chapter or section numbers) were found in a sequence that appeared to show some disarrangement, with much alteration of pagination. Titles and original pagination on the various parts of the draft have been given in the following descriptions.
8pp typescript draft with manuscript revision; further typescript draft; revised version with copy of Darlington's letter to the publisher.
Two sets of proofs, both corrected.
Further typescript pages of text are inserted.
Manuscript and typescript draft pages for various parts of the article (incomplete and disarranged).
Included is a postcard from J.P. Lotsy to Darlington (August 1928) accepting an article by Darlington for 'Genetica'. One set of pages is headed 'Appendix'.