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A revision of Clavija - Opera Botanica 107 (Theophrastaceae) - download pdf or read online

By Bertil Ståhl.

ISBN-10: 8788702561

ISBN-13: 9788788702569

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There was certainly not more aggregation than would have followed from an immersion of from 5 m. to 10 m. in an equally strong solution of the carbonate. Lastly, a leaf was placed in thirty minims of a solution of one part of phosphate to 43,750 of water (1 gr. ); this soon caused the tentacles to be strongly inflected; and after 24 hrs. the contents of the cells were aggregated into oval and irregularly globular masses, with a conspicuous current of protoplasm flowing round the walls. But after so long interval aggregation would have ensued, whatever had caused inflection.

Mass well marked, extending down the tentacles for a length equal to that for the glands. After 2 hrs. the contents of almost all the ceIl~ in all the tentacles were broken up into masses of protoplasm. A leaf was immersed in a solution of one part of oxalate of ammonia to }46 of water; and after 24 m. some, but not a conspicuous, change could be seen within the cells beneath the glands. After 17 m. plenty of spherical masses of protoplasm were formed, and these extended down the tentacles for about the length of the glands.

At first we thought - but, as we now know, erroneously - that particles of such low specify gravity as those cork, thread and paper, would never come into contact with the surfact;s of the glands. The particles cannot act simply by their weight being added to that of the secretion, for small drops of water, many times heavier than the particles, were repeatedly added, and never produced any effect. Nor does the disturbance of the secretion produce any effect, for long threads were drawn out by a needle, and affixed to some adjoining object, and thus left for hours; but the tentacles remained motionless.

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A revision of Clavija - Opera Botanica 107 (Theophrastaceae) by Bertil Ståhl.


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