. Contributions from the Hull Botanical Laboratory. Plants. 34 BOTAXICAL GAZETTE [JULY marked effects entered: (a) swelling back of the root tip, and lb) turning and coiling of root (fig. i); (3) concentration 1:40; growth in length greatly retarded, also considerable swelling; coiling present, but the coils smaller and tighter. With ethylene.—(1) Concentration 1: 100,000 (that is, corre- sponding to ethylene of illuminating gas with (1) above); appar- ently no effect; normal growth ensued; (2) concentration 1: 10,000; responses similar to those shown in fig. 1 but somewhat more pronounced; (3
. Contributions from the Hull Botanical Laboratory. Plants. 34 BOTAXICAL GAZETTE [JULY marked effects entered: (a) swelling back of the root tip, and lb) turning and coiling of root (fig. i); (3) concentration 1:40; growth in length greatly retarded, also considerable swelling; coiling present, but the coils smaller and tighter. With ethylene.—(1) Concentration 1: 100,000 (that is, corre- sponding to ethylene of illuminating gas with (1) above); appar- ently no effect; normal growth ensued; (2) concentration 1: 10,000; responses similar to those shown in fig. 1 but somewhat more pronounced; (3) concentration 1:1000; little or no growth in length; strongly swollen, no coils. The parallel experiments with ethylene gave some evidence that the toxic effect recorded for the illuminating gas may be due to ethylene present in that gas because corresponding concentra- tions of illuminating gas and the ethylene-air mixture gave quite parallel 1.—Outline of Vicia Faba roots, showing the effects of illumi- nating gas on growth; A, control. 2. With entire plants Material, radish, mustard, and tomato. The roots and hypo- cotyls gave responses as follows: Radish.—Exposure period 48 hours. With illuminating gas.—(1) Concentration 1:500; bending of root evident (similar to those of fig. 1); no coiling; no swelling of hypocotyl or root; (2) concentration 1:5000; coiling and bending of root evident; no enlargement of hypocotyl or root. Mustard.—Exposure period 48 hours. With illuminating gas.—(1) Concentration 1:100; coiling and bending of root evident (similar to those of fig. 1); swelling of hypo- cotyl evident; no swelling of root; (2) concentration 1:11,000; bending of root slight; no other effect; (3) concentration 1: 20,000; bending of root slight; no other effect. Tomato.—Exposure period 3 days. With illuminating gas.—(1) Concentration 1:500; swelling between stem and root (fig. 2); growth considerably retarded; (2) concentration 1:10,000; swelling as
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1895
