. Contributions from the Hull Botanical Laboratory. Plants. '- **. '. Fig. 4.—a, a flower that has just opened; b, the same after being corked in a 20-liter flask of air for 24 hours; c, a flower that has just opened; d, the same after being exposed 12 hours to 1 part of illuminating gas in 40,000; e, result of treating a flower that just opened for 12 hours with 1 part of ethylene in 2,000,000. of gas per 20,000 (four times killing concentration for three days' exposure). On a similar bud 5CC for one day was considerably more injurious than o. 5" for three days. The stigmas did not proje
. Contributions from the Hull Botanical Laboratory. Plants. '- **. '. Fig. 4.—a, a flower that has just opened; b, the same after being corked in a 20-liter flask of air for 24 hours; c, a flower that has just opened; d, the same after being exposed 12 hours to 1 part of illuminating gas in 40,000; e, result of treating a flower that just opened for 12 hours with 1 part of ethylene in 2,000,000. of gas per 20,000 (four times killing concentration for three days' exposure). On a similar bud 5CC for one day was considerably more injurious than o. 5" for three days. The stigmas did not project, but the petals were markedly discolored. During the entire period of experimentation there was no very marked variation in the toxicity of the gas 1 In determining the toxic limits we located a concentration that produced the effect while one-half that concentration did not. It is clear that this permits consider- able va-iation without detection. It is not possible to locate the toxic limits more closely, due to the variation in the flowers. It is clear, however, that this gives a very good idea of the magnitude of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hull Botanical Laboratory. [Chicago : University of Chicago Press
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1895
