| Massachusetts - 1875 - 692 頁
...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... | |
| James Bell Pettigrew - 1874 - 414 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... | |
| James Bell Pettigrew - 1874 - 422 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... | |
| State Pomological Society of Michigan - 1875 - 592 頁
...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... | |
| |