A Mechanico-Physiological Theory of Organic EvolutionNägeli, Carl
Science
A Mechanico-Physiological Theory of Organic Evolution
Nägeli, Carl
Evolution
Two other matters remain to be noticed. The first of these is Naegeli's
use of the German word _Anlage_. We have been unable to give a perfectly
satisfactory translation of this word in its technical meaning. We have
received some comfort, though but little help, from the experience of
the translators of similar works. Selmar Schoenland, in translating from
Weismann, renders it variously as "germ," "germ of structure," "germ (of
Naegeli)," "germ of Naegeli," "Naegeli's preformed germ of structure,"
"preformed germs," "tendency." Another translator renders the word as
"constitutional element." The translation, "determinant," which we have
selected is an appropriation of an analogous but not absolutely
identical technical term from Weismann's _Germinal Selection_. The use
of the word in this connection is open to the objection that it has
previously been used technically for a somewhat different idea by
another author. M. C. Potter, in his translation of Warming's
_Systematic Botany_, following Dr. E. L. Mark, renders the word _Anlage_
as "fundament." Dr. H. C. Porter, in his translation of the _Bonn
Text-Book of Botany_, renders the same word as "rudiment."
In general the word Anlage means beginning, plan, disposition to
anything, and hence involves the ideas of origin, organization and
tendency. Sanders defines the word in one of its meanings as: "The act
of planning or beginning anything; the act of laying the foundation of
any work intended to be carried on toward completion, in order that from
the beginning made, a definite thing may be developed or may develop
itself"; (_i.e._, to determine, in the sense of limiting to a particular
purpose or direction, hence determinant). "Also, the thing begun or
planned, considered as the basis and germ of the further development of
that which has already originated."
In its restricted use as applied to organisms it would mean "germ," in
the sense of embryonic starting point. More specifically, it is a
portion of plastic, organized substance, functioning as an individual
and containing potentially an elemental organ plus a formative power. In
Naegeli's own words, "There exists an essential difference between the
substance of a mature organism which does not possess the capability of
further development, and the substance of an egg, which does possess
this capability. By virtue of this difference the egg-substance is
characterized as the _Anlage_, or germ of the mature organism. All
characteristics of the adult condition are potentially contained in the
ovum."
Naegeli was not the first to assume the existence of a unit of
organization intermediate between the molecule and the cell. E. B.
Wilson, in his _The Cell in Inheritance and Development_, states the
case as follows:
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