Prometheus, or, biology and the advancement of man / by H.S. Jennings.
- Herbert Spencer Jennings
- Date:
- [1925]
Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Credit: Prometheus, or, biology and the advancement of man / by H.S. Jennings. Source: Wellcome Collection.
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![PROMETHEUS salamander that lives throughout its life in water, has a heavy, broad body, a tail flattened for swimming, and external gills. In this condition it becomes mature, lays its eggs in the water ; produces young that inherit its characteristics, and finally dies. This continues for generation after generation. A number of these axolotls were kept for years in the Zoological Gardens at Paris ; they showed the inherited characteristics above set forth. Breeding experiments on these animals would show these characteristics to be inherited in the usual Mendelian manner. But after years in which these were the only inherited characteristics that they were known to possess, certain different environmental conditions were brought into action, and thereupon, to [54]](https://iiif.wellcomecollection.org/image/B18032576_0057.JP2/full/800%2C/0/default.jpg)
