A Contribution To The Morphology And Biology Of The Stentors

Paperback | February 5, 2012

byHerbert Parlin Johnson

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893. Excerpt: ... weather. This concurrence of favorable conditions causes the brook to swarm with all kinds of active aquatic life throughout the winter. I have obtained Blue Stentors at various points along the brook, and in every month from October to June. What becomes of them in summer I have never been able to determine. During July and August, 1890, I made numerous gatherings at many points along the stream, but without the least success. The Blue Stentor of this country is undoubtedly identical with the S. cceruleus of Europe, but those I have obtained certainly much exceed the dimensions commonly given for the European form. Stein states ('67, p. 240) that the present species attains about the same size as S. polymorphus, the length of which in extension is given as half-a-line; i. e., rather more than a millimeter. Maupas ('88, p. 230) gives as the "normal size," length 1.176 mm. and diameter.27 mm. In the semi-contracted condition of swimming the Alewife Brook specimens are commonly a millimeter long, while sessile and extended individuals generally attain a length of 2 mm. and a diameter of.476 mm. across the frontal field. Individuals in a state of extreme extension even reach a length of 4 mm. On the other hand, the largest measurement of 5. polymorphus (fully extended) I have ever made was 1.466 mm. by.365 mm. Stein remarks (p. 242) that the nodes of the meganucleus of S. cceruleus are usually spindle-shaped, while those of S. polymorphus are oval. I have frequently seen spindle-shaped nodes in the Blue Stentor, but oval nodes are much commoner. III. Morphology. For the investigation of nearly all subjects relating to the morphology and physiology of the Stentors, 5. cceruleus is by far the most favorable form. It is of large size; all its structural feature...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893. Excerpt: ... weather. This concurrence of favorable conditions causes the brook to swarm with all kinds of active aquatic life throughout t...

Format:PaperbackDimensions:34 pages, 9.69 × 7.44 × 0.07 inPublished:February 5, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217264131

ISBN - 13:9780217264136

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