. Essentials of botany. Botany; Botany. OF LEAVES 133 surfaces. Stomata occur on the epidermis of yoimg stems, being replaced later by the lenticels. Those plants which, like the cactuses, have no ordinary leaves, transpire through the stomata scattered over their general surfaces. EXPERIMENT XV Amount of Water lost by Transpiration. — Procure a thrifty hydran- gea^ growing in a small flower-pot. Calculate the area of the leaf- surface 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 against this, and count
. Essentials of botany. Botany; Botany. OF LEAVES 133 surfaces. Stomata occur on the epidermis of yoimg stems, being replaced later by the lenticels. Those plants which, like the cactuses, have no ordinary leaves, transpire through the stomata scattered over their general surfaces. EXPERIMENT XV Amount of Water lost by Transpiration. — Procure a thrifty hydran- gea^ growing in a small flower-pot. Calculate the area of the leaf- surface 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 against this, and counting the number of squares and parts of squares covered by the leaf. This area multiplied by the number of leaves will give ajpproxi- mately the total evaporating surface. Transfer the plant to a glass bat> tery jar of suitable size. Cover the jar with a piece of sheet lead, slit to admit the stem of the plant, invert the jar, and seal the lead to the glass with a hot mixture of beeswax and resin. Seal up the slit and the opening about the stem with graft- ing wax. A thistle-tube, such as is used by chemists, is also to be in- serted, as shown in Fig. 95.^ The mouth of this should be kept corked when the tube is not in use for vratering. A Hydrangea. for Exp. XV. iThe common species of the green- houses, Hydrangea Hortensia. 2 It will be much more convenient to tie the hydrangea if one has heen chosen that has but a single main stem. Instead of the hydrangea the com- mon cineraria, Senecio cruentus, does very 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. Boston, Ginn
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