![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_377.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. 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_059.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/scans/1875_Variation_F880(online)/1875_Variation_F880.1_113.jpg)