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The principal correspondent is M.B. Crane, pomologist. Crane's correspondence relates to his forthcoming book, 'Genetics in Relation to Horticulture' (with W.J.C. Lawrence).

The pages are titled as follows, with the names of the authors or exhibition creators in brackets. 'The Origin of New Forms in Rubus' (M.B. Crane and Darlington) 'The Systematic Importance of Chromosome Studies in Tulipa Clusiana' (the late W.C.F. Newton and Darlington) 'Multiple Association of Similar Chromosomes in Polyploids' (the late W.C.F. Newton and Darlington)