A Treatise On Zoology
A Treatise On Zoology
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Yellow Cells. The ingestion of solid food is, however, not essential to the life of Thalassicolla for at least several months. If kept in water that has been taken from the open sea and com- pletely filtered, Thalassicolla will live for at least six months without showing retrogressive changes beyond a shrinkage of calymmal volume. Brandt, who has carried out experimental studies on these organisms for many years, states (24) that if comparable batches are maintained in such filtered water in d...arkness and in light, the illuminated ones alone survive. He infers that Thalas- sicolla under these conditions lives upon food which is in some way elaborated under the influence of light ; and in point of fact such a substance starch does exist in the ectoplasm. It occurs both free in the capsular layer arid imbedded in the substance of certain corpuscles which are scattered through the calymma and are known as the "yellow cells. " The significance of these cells or " zooxanthellae " Is, in Brandt's view, a nutritive one.
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You can find similar books in the "Read Also" column, or choose other free books by E Ray Edwin Ray Lankester to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Yellow Cells. The ingestion of solid food is, however, not essential to the life of Thalassicolla for at least several months. If kept in water that has been taken from the open sea and com- pletely filtered, Thalassicolla will live for at least six months without showing retrogressive changes beyond a shrinkage of calymmal volume. Brandt, who has carried out experimental studies on these organisms for many years, states (24) that if comparable batches are maintained in such filtered water in d...arkness and in light, the illuminated ones alone survive. He infers that Thalas- sicolla under these conditions lives upon food which is in some way elaborated under the influence of light ; and in point of fact such a substance starch does exist in the ectoplasm. It occurs both free in the capsular layer arid imbedded in the substance of certain corpuscles which are scattered through the calymma and are known as the "yellow cells. " The significance of these cells or " zooxanthellae " Is, in Brandt's view, a nutritive one.
What to read after A Treatise On Zoology?
You can find similar books in the "Read Also" column, or choose other free books by E Ray Edwin Ray Lankester to read onlineMoreLess
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