. Foundations of botany. Botany; Botany. 160 FOUNDATIONS OF B0TA2JY knowledge to an exact form, to learn how much water a given plant transpires under certain conditions. It is also desirable to find out whether different kinds of plants transpire alike, and what changes in the temperature, the dampness of the air, the brightness of the light, to which a plant is exposed, have to do with its transpiration. Another experiment will show whether both sides of a leaf transpire alike. EXPERIMENT XXX Amount of Water lost by Transpiration.—Procure a thrifty hydran- gea' and a small "india-rubber
. Foundations of botany. Botany; Botany. 160 FOUNDATIONS OF B0TA2JY knowledge to an exact form, to learn how much water a given plant transpires under certain conditions. It is also desirable to find out whether different kinds of plants transpire alike, and what changes in the temperature, the dampness of the air, the brightness of the light, to which a plant is exposed, have to do with its transpiration. Another experiment will show whether both sides of a leaf transpire alike. EXPERIMENT XXX Amount of Water lost by Transpiration.—Procure a thrifty hydran- gea' and a small "india-rubber plant,"^ each growing in a small flower-pot, and with the number of square inches of leaf-surface in the two plants not too widely different. Calculate the area of the leaf-surface for each plant, by dividing the surface of a piece of tracing cloth into a series of squares one-half inch on a side, holding an average leaf of each plant against this and counting the number of squares and parts of squares covered by the leaf. Or weigh a square inch of tinfoil on a very delicate balance, cut out a piece of the same kind of tinfoil of the size of an average leaf, weigh this and calculate the leaf-area from the two weights. This area, multiplied by the number of leaves for each plant, wiU give approximately the total evaporating surface for each. i Transfer each plant to a glass battery jar of suitable size. Cover. Fig. 122. — A Hydrangea potted in a Battery Jar for Exp. XXX. 1 The common species of the greenhouses, Hydrangea Hortensia. 2 This is really a fig, Ficus 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Eastwood, Alice, 1859-1953. Boston, Ginn & Co.
Size: 1289px × 1939px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
