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 . sues the cells firmly cohere, the cell-walls being persis-tent. In the vascular tissue, the cells run together by the absorption of theircontiguous surfaces to form the tubes, ducts, or vessels known as the vasculartissues. 16 DK J. BELL PETTIGREW ON THE but it is not thereby rendered doubtful whether it is the functionof arteries to convey It ought, mo
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 . sues the cells firmly cohere, the cell-walls being persis-tent. In the vascular tissue, the cells run together by the absorption of theircontiguous surfaces to form the tubes, ducts, or vessels known as the vasculartissues. 16 DK J. BELL PETTIGREW ON THE but it is not thereby rendered doubtful whether it is the functionof arteries to convey It ought, moreover, not to be overlooked, that while the presenceof air in the vessels is fatal to the circulation in animals, it doesnot of necessity follow that it is so in plants. The conditions arenot identical. In animals, the walls of the larger vessels are notpermeable by fluids, so that air admitted into them has no meansof escaping therefrom ; in plants, on the contrary, the walls of thevessels are especially permeable, a free egress being provided by thepitted and other The presence of air in the vascularbundles of plants is therefore a natural condition at certain periods—a plant requiring air as well as sap. Fig. Fig. 22.
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