. Animal life as affected by the natural conditions of existence. Animal ecology. 74 THE INFLUENCE OF INANIMATE SURROUNDINGS. living within it—commensals or ' messmates,' as they are called. Kleinenberg's observations on Hydra vlridis are decidedly favourable to the former of these views; Schulze's statements as to Vortex viridis are equally positive in favour of the second. For he expressly declares that the chlorophyll bodies of this worm are true cells, unlike those of plants; that they divide and multiply spontaneously, which the chlorophyll bodies do not; and finally that they are in some
. Animal life as affected by the natural conditions of existence. Animal ecology. 74 THE INFLUENCE OF INANIMATE SURROUNDINGS. living within it—commensals or ' messmates,' as they are called. Kleinenberg's observations on Hydra vlridis are decidedly favourable to the former of these views; Schulze's statements as to Vortex viridis are equally positive in favour of the second. For he expressly declares that the chlorophyll bodies of this worm are true cells, unlike those of plants; that they divide and multiply spontaneously, which the chlorophyll bodies do not; and finally that they are in some individuals wholly wanting. The importance of these ai-guments is increased by other facts. It is known that most of theRadiolaria in- variably bear in their body certain peculiar particles known as a. Fig. 18.—G Uozoutn inerme (Haeckel), a Radiolarian forming colonies, a, a colony ; b, a solitary individual, or, more correctly, the internal vesicle of one (the shaded bodies are globules of fat, the outer spots indicate the numerous yellow cells). the yellow cells (fig. 18), in which a few starch-grains are always present. These yellow or sometimes green cells occur in many fresh-water Eadiolarians which have lately been often made the subject of minute investigations. From these, above all from the very careful labours of Cienkowsky. it has recently been proved that these yellow cells in the Eadiolarians are in fact nothing more than one-celled Algse living as messmates with the animal in the same sort of community as certain Fungi and Alga? which, as is well known, combine to form the apparently. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Semper, C. (Carl), 1832-1893. New York, D. Appleton and Co.
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