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During 1867 Darwin intensified lines of research that were to result in two important publications, Descent of Man and Selection in Relation to Sex and Expression of the Emotions in Man and Animals. Darwin circulated a questionnaire on human expression and also started to ask correspondents about sexual differences in animals and birds. At the same time, he was working on the proof-sheets of Variation of animals and plants under domestication, and negotiating almost weekly with translators. For information on the Charles Darwin Correspondence Project, see http://www.lib.cam.ac.uk/Departments/Darwin.