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.

    45/112 (page 41)
    BIOLOGICAL BACKGROUND turned sideways, or completely round, the differentiating and adjusting influence creeps through it from the same point as before, but now in a different or reversed direction, so far as the cells are concerned. The cells that were to have formed skin produce spinal cord ; those that would have produced eyes may form midbrain, or skin or ear, depending on just how they are placed with reference to the spreading differentiating influence ; and so of the others. Or, transplant a small ■ piece of prospective skin to the centre of the eye-producing region ; it now transforms into eye instead of into skin ; transplant a prospective ear to another region, and it becomes skin or spinal cord, as its place in the pattern requires. It is proved that any par¬ ticular cell may become part of any one [43]