![Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. First edition, first issue. Volume 1. Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. First edition, first issue. Volume 1.](http://darwin-online.org.uk/converted/scans/1868_Variation_F877.1(online)/1868_Variation_F877.1_071.jpg)
Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. First edition, first issue. Volume 1.
![Darwin, C. R. 1875. The variation of animals and plants under domestication. London: John Murray. 2d edition. Volume 1. Darwin, C. R. 1875. The variation of animals and plants under domestication. London: John Murray. 2d edition. Volume 1.](http://darwin-online.org.uk/converted/published/1875_Variation_F880/1875_Variation_F880_fig25.jpg)
Darwin, C. R. 1875. The variation of animals and plants under domestication. London: John Murray. 2d edition. Volume 1.
![Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. First edition, first issue. Volume 1. Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. First edition, first issue. Volume 1.](http://darwin-online.org.uk/converted/scans/1868_Variation_F877.1(online)/1868_Variation_F877.1_163.jpg)
Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. First edition, first issue. Volume 1.
![Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1. Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.](http://darwin-online.org.uk/converted/scans/1868_Variation_F878.1(online)/1868_Variation_F878.1_160.jpg)
Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.
![Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1. Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.](http://darwin-online.org.uk/converted/scans/1868_Variation_F878.1(online)/1868_Variation_F878.1_152.jpg)