Volume 1

Essays upon heredity and kindred biological problems / by August Weismann ; edited by Edward B. Poulton, Selmar Schönland, and Arthur E. Shipley, authorized translation.

  • Shipley A. E. (Arthur Everett), Sir, 1861-1927.
Date:
1891-1892
Catalogue details

Licence: Public Domain Mark

Credit: Essays upon heredity and kindred biological problems / by August Weismann ; edited by Edward B. Poulton, Selmar Schönland, and Arthur E. Shipley, authorized translation. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    Orthonectides (after Julin). 8. First female form: the cap-like anterior part has become detached and the egg-cells {eiz) are escaping. 9. Second female form: <?ts = egg- cells; outside these are the muscular layer (m) and the ectoderm i^ekt]. 10 and II. Two fragments of such a female broken to pieces by spontaneous division : the egg-cells are embedded in a granular mass, and undergo embryonic development in it at a later period ; the whole is surrounded by ciliated cells. 12. Male discharging the spermatozoa by the breaking up of the ectoderm {ekt); sp spermatozoa; m muscle.