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" In summer, when the leaves are fully formed, the connecting links are supplied by the capillary vascular expansions formed in them, — the tubes are in fact converted into syphons. As both extremities of the syphons are full of sap in spring and early... "
Observations on the Phenomena of Plant Life: A Paper Presented to the ... - 第 21 頁
William Smith Clark 著 - 1875 - 111 頁
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Public Documents of Massachusetts, 第 3-4 卷

Massachusetts - 1875
...structure aud action is interrupted, and •nil the tubes (they are a second time single tubes) convfl^ moisture from above downward, as happens in autumn....in spring, the upward rush of sap being followed by a slight downward current, as happens in endosmose and exosmose. As, moreover, the spongioles of the...
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The Physiology of the Circulation in Plants: In the Lower Animals, and in ...

James Bell Pettigrew - 1874 - 329 頁
...immediately established. When the downward current has nourished the plant and stored up its starch granules for the ensuing spring, the leaves fall,...second time single tubes) convey moisture from above downwards, as happens in autumn. As the vascular expansions or networks are found also in the stems...
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The Physiology of the Circulation in Plants: In the Lower Animals, and in ...

James Bell Pettigrew - 1874 - 329 頁
...nourished the plant and stored up its starch granules for the ensuing spring, the leaves fall, the n syphon structure and action is interrupted, and all...second time single tubes) convey moisture from above downwards, as happens in autumn. As the vascular expansions or networks are found also in the stems...
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Annual Report of the Secretary of the State Pomological Society of ..., 第 4 卷

State Pomological Society of Michigan - 1875
...syphons. As both extremities of the syphons are full of sap in spring and early sammer, an upward and downward current is immediately established. When...in spring, the upward rush of sap being followed by a slight downward current, as happens in endosmose andexosmose. As, moreover, the spongioles of the...
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