![de Beer, Gavin ed. 1960. Darwin's notebooks on transmutation of species. Part I. First notebook [B] (July 1837-February 1838). Bulletin of the British Museum (Natural History). Historical Series 2, No. 2 (January): 23-73. de Beer, Gavin ed. 1960. Darwin's notebooks on transmutation of species. Part I. First notebook [B] (July 1837-February 1838). Bulletin of the British Museum (Natural History). Historical Series 2, No. 2 (January): 23-73.](http://darwin-online.org.uk/converted/scans/1960-7_Notebooks_F1574/1960_Notebooks_F1574a_037.jpg)
de Beer, Gavin ed. 1960. Darwin's notebooks on transmutation of species. Part I. First notebook [B] (July 1837-February 1838). Bulletin of the British Museum (Natural History). Historical Series 2, No. 2 (January): 23-73.
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![de Beer, Gavin ed. 1960. Darwin's notebooks on transmutation of species. Part I. First notebook [B] (July 1837-February 1838). Bulletin of the British Museum (Natural History). Historical Series 2, No. 2 (January): 23-73. de Beer, Gavin ed. 1960. Darwin's notebooks on transmutation of species. Part I. First notebook [B] (July 1837-February 1838). Bulletin of the British Museum (Natural History). Historical Series 2, No. 2 (January): 23-73.](http://darwin-online.org.uk/converted/scans/1960-7_Notebooks_F1574/1960_Notebooks_F1574a_027.jpg)