The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etcof the Royal college of surgeons of Edinburgh, in the summer of 1872 . se or cross circulation is accounted for. Ordinary capillarytubes form vessels with impermeable walls; the capillary tubes ofnature, on the contrary, form vessels with permeable walls. Thecases, although analogous, are not identical. It is necessary thatthe crude sap taken up from the earth traverse the plant in itslength and breadth; and this, as I have endeav
The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etcof the Royal college of surgeons of Edinburgh, in the summer of 1872 . se or cross circulation is accounted for. Ordinary capillarytubes form vessels with impermeable walls; the capillary tubes ofnature, on the contrary, form vessels with permeable walls. Thecases, although analogous, are not identical. It is necessary thatthe crude sap taken up from the earth traverse the plant in itslength and breadth; and this, as I have endeavoured to show, canin a great measure be effected by the agency of natural laws andwithout effort on the part of the plant or tree itself. From re-searches just made by Goltz, it would appear that the animaltissues have a similar power of absorbing and spreading a fluidfrom part to part quite irrespective of the force exercised by theheart in the general circulation. He ascertained this by detachingthe heart from the circulation, and presenting strychnia to thetissues. Part of the tissues thus poisoned was administered tohealthy frogs as food, and induced in all of them the phenomenacharacteristic of strychnia-poisoning. Fig. *IJ1 gg§. Fig. 3fi.—Compound syphon with expanded absorbing and evaporating surfaces, coveredwith animal or vegetable membrane, to correspond with the roots and leaves of this form of syphon {b, a), which essentially resembles that formed by the vessels(Fig. 29) and terminal vascular loops (Figs. 23, 24, and 25) of plants, fluids may be trans-mitted in advancing continuous waves (vide arrows), or made to oscillate. The peculiarityof this syphon consists in its being composed of a number of simple syphons united in sucha manner that their free extremities are alternately directed downwards and upwards. Thelong legs of the simple syphon correspond to tlie expanded portions of the figure, and repre-sent the leaves and roots of the plant,
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