from The Century Dictionary.
- noun Same as
from the GNU version of the Collaborative International Dictionary of English.
- noun (Biol.) Same as
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Alternative form of
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By division of the fertilized egg into cells, the idioplasm would be - come distributed to every new cell and give to each its hereditary character.
It was August Weismann, once a student of Nägeli, who undertook the task of properly relating Nägeli's concept of the idioplasm to the recent developments of cytology.
Evolution was thought to take place through changes in the idioplasm, changes going on continuously and impelled by some inherent force toward inevitable change.
Nägeli's idioplasm with the chromosomes, but Weis - mann extended the conception to the postulate that each chromosome is made up of hereditary elements he called “ids,” which in turn are composed of heredi - tary determinants for each inherited characteristic.
But his internal "principle of progress" is at the bottom just as teleological as the vital force of the Vitalists, and the micella structure of the idioplasm is just as hypothetical as the "dominant" structure of the germ-plasm.
_Mechanisch-Physiologische Theorie der Abstammungslehre_  which is to a great extent in agreement with Weismann, constructed a theory of the idioplasm, that represents it (like the germ-plasm) as developing continuously in a definite direction from internal causes.