. Carnegie Institution of Washington publication. Zrrig. field Irr~ig- Dry FlO. ifl.—Relative dimensions of wood cylinder and cortex, wet and dry, in twigs of field and irrigated plants. X20. error is introduced by this method, as some of the resin exudes from the cut ends of the cortex and infiltrates into the wood. This error is appar- ent in table 41, in which the ratios of steamed material are smaller than in Table 41.—Ratio of bark to wood by weight for field and irrigated shrub, as deter- mined after (a) steaming, (b) moist chamber. Two pieces each of field and irrigated plants (Ce
. Carnegie Institution of Washington publication. Zrrig. field Irr~ig- Dry FlO. ifl.—Relative dimensions of wood cylinder and cortex, wet and dry, in twigs of field and irrigated plants. X20. error is introduced by this method, as some of the resin exudes from the cut ends of the cortex and infiltrates into the wood. This error is appar- ent in table 41, in which the ratios of steamed material are smaller than in Table 41.—Ratio of bark to wood by weight for field and irrigated shrub, as deter- mined after (a) steaming, (b) moist chamber. Two pieces each of field and irrigated plants (Cedros, April 1909): (a) Field plant pieces to mm. diameter; (b) irrigated plant pieces, to 4 mm. diam- eter. Each piece of (a) segmented into fourths and alternate fourths placed in each of two lots; (b) segmented into fourteenths, similarly placed in each of two lots. One lot (I) of (a) and of (b) steamed, de-barked, dried in oven, and weighed. The other lot (II) of each placed in a moist chamber till fit for separating wood and bark; then dried in oven and weighed. Class of plant. Treatment. Weight of wood. Weight of bark. Ratio. (a) I. Field (Cedros) (a) II. Field (Cedros) (b) I. Irrig. (Cedros) Moist Moist gram. gram. 0. 2817 i-75 + + 1 The substance of what follows under this caption was presented in a paper entitled "The Responses of the Guayule, Parthenium argentatum Gray, to Irriga- tion," before the Botanical Society of America, at its Boston meeting, December 1909. (Lloyd, 19106.). 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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