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Ryder's Seeds for Results, " Grow More Food" 1940, Ryder & Son Ltd., St Albans; the "Growmore" collection of vegetable seeds as planned and recommended by the Ministry of Agriculture and Fisheries

Notes, scoring (yield, etc.): population size and selection experiment. Contains typescript report on earlier stages of experiment (1951).

Data tables: yield, ear length.

Correspondence with research institutes in France, Switzerland, USA, Germany, Sweden, Canada, Cyprus, Netherlands and elsewhere, re exchange of scions (mostly apple/ pear, also peach, rhubarb)

Invoices/correspondence for sales of membership names and addressess (sold as address labels)

2 oil-painted photographs of a Salix branch (3 stems) front and back views on 2 sides of folded white card. Front labelled 'Salix' and inscribed 'oil paint on photo, William Bateson said best'. Inside inscribed 'Salix triandra', 'natural size', signed 'HCO', dated Dec 1924.

One letter only from Salmon to Bateson, 1916, with accompanying notes, on rogues in hops; one letter only from Sander and Sons, 1914, re potato, with 7pp notes on the introduction of the potato into Europe.

Pollen tube growth study: notes on families. Includes a dried specimen.

Pollen tube growth and self-incompatibility: detailed notes on families.