Second letter from Cyril Dean Darlington, to Mr Diamond, regarding five papers 'The external mechanics of the chromosomes I—The scope of enquiry', 'The external mechanics of the chromosomes II-Meiosis in diploids', 'The external mechanics of the chromosomes III-Meiosis in triploids', 'The external mechanics of the chromosomes IV—Abnormal mitosis and meiosis' and 'The External mechanics of the chromosomes V—The balance theory of mitosis' by Cyril Dean Darlington Sectional Committee: Botany Was away recently, as expressed by Alfred Daniel Hall. Proposes a new formula, but if this is not satisfactory to the referee, he can insert his own, so long as it is stated clearly in a footnote that this was not drafted by the author. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on recto as received 23 September 1936. 21 September 1936