Prometheus, or, biology and the advancement of man / by H.S. Jennings.

  • Herbert Spencer Jennings
Date:
[1925]
Catalogue details

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.

    47/112 (page 43)
    BIOLOGICAL BACKGROUND help determine what the parts of the body shall become. There are a vast number of such intermediate products, necessarily produced before the adult structures can be made ; some of them are the internal secretions, hormones, or endocrine products, which are now the reigning sensation in biology. These are the relatively early and simple products of the chromosomal genes in their interactions with each other and with other things. A difference of a single chromosome, it can be proved, causes in early stages two diverse hormones to be produced in two individuals ; and this gives rise in turn to diversity of sex, with the great number of differential details that this includes. The production, distribution, and action of these intermediary chemicals, with the consequent method [45]