He sum up the evidence strongly in favor of their parasitic nature.
Meanwhile similar bodies were being described by the investigators
of other groups. Haeckel had already compared the yellow cells of
Radiolarians to the so-called liver-cells of _Velella_; but the brothers
Hertwig first recalled attention to the subject in 1879 by expressing
their opinion that the well-known "pigment bodies" which occur in the
endoderm cells of the tentacles of many sea-anemones were also parasitic
algae. This opinion was founded on their occasional occurrence outside
the body of the anemone, on their irregular distribution in various
species, and on their resemblance to the yellow cells of Radiolarians.
But they did not succeed in demonstrating the presence of starch,
cellulose, or chlorophyl. The last of this long series of researches is
that of Hamann (1881), who investigates the similar structures which
occur in the oral region of the Rhizostome jelly-fishes. While agreeing
with Cienkowski as to the parasitic nature of the yellow cells of
Radiolarians, he holds strongly that those of anemones and jelly-fishes
are unicellular glands.
In the hope of clearing up these contradictions, I returned to Naples
in October last, and first convinced myself of the accuracy of the
observation of Cienkowski and Brandt as to the survival of the yellow
cells in the bodies of dead Radiolarians, and their assumption of the
encysted and the amoeboid states.
Pages:
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144