. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 274 TRANSFER OF WATEE THROUGH THE PLANT, Ueheraln.^ drops. This metliod of demonstrating transpiration has been used, when somewhat modified, l)y many investigators, notably ' It is well adapted to class experiments, since very simple appliances'^ can be nsed : for instance, a leafy stem can be inserted in a piece of pasteboard, and the cut end of the stem placed in a tumbler of water; another tum- bler, inverted over the stem, rests on the pasteboard. The wate
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 274 TRANSFER OF WATEE THROUGH THE PLANT, Ueheraln.^ drops. This metliod of demonstrating transpiration has been used, when somewhat modified, l)y many investigators, notably ' It is well adapted to class experiments, since very simple appliances'^ can be nsed : for instance, a leafy stem can be inserted in a piece of pasteboard, and the cut end of the stem placed in a tumbler of water; another tum- bler, inverted over the stem, rests on the pasteboard. The water in the lower tnmbler is prevented from evaporating into the upper one. The amount of water which collects on the inside of the upper tumbler comes wliollj- from the transpiration of the plant, and will be found to vary according to the surroundings (see page 275 et seq). 736. If a weighed amount of calcic chlo- ride is placed with a transpiring plant in a confined atmosphere,the salt will readilj' take up the aqueons vapor, and its increase in weight gives the amount of water exhaled by the plant. This method of measuring the amoiuit of transpiration has been em- ploj-ed by several experimenters, who have obtained resnlts sub- stantiality in accord. It must be noted, however, that in this method the air to which the plant is exposed is rendered ab- normally drj- bj- the presence of the salt, and tlie plant is there- fore subjected to an unusual draft upon its water-supply. 737. Garreau's method of comparing the relative amounts of transpiration on opposite sides of a leaf is based on that last. 147. 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 Goodale, George L. (George Lincoln), 1839-1923. New York [etc. ] : American Book Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectplantanatomy, bookyea
