He showed that they
were capable not only of surviving the death of the Radiolarian, but
even of multipying, and of passing through an encysted and an amoeboid
state, and urged their mode of development and the great variability of
their numbers within the same species as further evidence of his view.
The next important work was that of Richard Hertwig, who inclined to
think that these cells sometimes developed from the protoplasm of the
Radiolarian, and failing to verify the observations of Cienkowski,
maintained the opinion of Haeckel that the yellow cells "fur den
Stoffwechsel der Radiolarien von Bedeutung sind." In a later publication
(1879) he, however, hesitates to decide as to the nature of the yellow
cells, but suggests two considerations as favoring the view of
their parasitic nature--first, that yellow cells are to be found in
Radiolarians which possess only a single nucleus, and secondly, that
they are absent in a good many species altogether.
A later investigator, Dr. Brandt, of Berlin, although failing to confirm
Haeckel's observations as to the presence of starch, has completely
corroborated the main discovery of Cienkowski, since he finds the yellow
cells to survive for no less than two months after the death of the
Radiolarian, and even to continue to live in the gelatinous investment
from which the protoplasm had long departed in the form of swarm-spores.
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