Injury, recovery, and death, in relation to conductivity and permeability . 0.—The ordinates denote the rate of diffusion of NaCl, CaClj and sea water through living tissue of Laminaria. NaCl diffuses more rapidly than sea water, while CaCh at first diffuses more slowly, then more rapidly than sea water. which has been previously treated with NaCl M thanfrom tissue treated with a balanced solution.^^ Tissue treated with CaClg M showed less exos-mosis than that treated \vith the balanced solution.^^ These results are also in harmony with the experi-ments on electrical conductivity. Fo
Injury, recovery, and death, in relation to conductivity and permeability . 0.—The ordinates denote the rate of diffusion of NaCl, CaClj and sea water through living tissue of Laminaria. NaCl diffuses more rapidly than sea water, while CaCh at first diffuses more slowly, then more rapidly than sea water. which has been previously treated with NaCl M thanfrom tissue treated with a balanced solution.^^ Tissue treated with CaClg M showed less exos-mosis than that treated \vith the balanced solution.^^ These results are also in harmony with the experi-ments on electrical conductivity. For exosmosis of pigments of Rhodymenia in relation to electricalresistance see Osterhout (1919, C). The concentrations of NaCl, CaClj and of the balanced solution werechosen so as to be approximately isotonic with the tissue. 208 INJUEY, EECOVEEY, AND DEATH In the third method employed by Brooks,^^ strips ofthe peduncle of the dandelion were placed in hypertonicsolutions and the rate of penetration of the salt into theprotoplasm was calculated from the rate at which the. Y-^^ i~^ ordinates denote the amount of exosmosis into distilled water from living tissue of Taraxacum officinale which had been previously treated with various solutions andthen placed in distilled water. Treatment with NaCl produces more exosmosis than treat-ment with a balanced solution, while treatment with CaCh produces less exosmosis. Theexperiments indicate that the measured exosmosis is largely due to salts present in the cellsbefore the application of reagents. If it were caused by the reagents (by diffusion out of thecell walls and intercellular spaces) it would be greater in CaCh than in NaCl. strips recovered their normal shape after being curvedby the action of hypertonic solution (the strips remainingin the solution during recovery). This gives the samekind of information as plasmolysis, but avoids the mostserious errors of that method. In Fig. 92, the rate of recovery is plotted against
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