. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. sts into the cell-sap thatfills the cell cavity, andthence into the tissues de-voted tO food-COnduCtion, of a Euphorbia leaf, magnified about 1800 diameters. as told in the next chapter. The minute size of the chloroplasts affords them large surface in proportion to their volume, and this gives a great advantage in the absorption of raw materialsand energy, and in the elimination ofthe finished product. The chloroplasts are always em-bedded in the cytoplasm close againstthe cell-
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. sts into the cell-sap thatfills the cell cavity, andthence into the tissues de-voted tO food-COnduCtion, of a Euphorbia leaf, magnified about 1800 diameters. as told in the next chapter. The minute size of the chloroplasts affords them large surface in proportion to their volume, and this gives a great advantage in the absorption of raw materialsand energy, and in the elimination ofthe finished product. The chloroplasts are always em-bedded in the cytoplasm close againstthe cell-wall, and this peripheral posi-tion is apparently an advantage toevery phase of their work; for, asFig. 72 will show, on one side wateris presented to the chloroplasts fromthe cell-sap, and on another carbondioxide from the intercellular spaces,and the vacuole affords an unob-structed way for the removal of themanufactured product. Also by thisarrangement the light entering the leaf from all parts of the sky has a clearer path to every chloroplast throughout the leaf than would otherwise be the case (Fig. 73).. FIG. 72.—Diagram to show theintake of carbon dioxide by thepalisade cells from the inter-cellular spaces, the absorption bythe chloroplasts of water fromthe cell-sap, and the passage offood from the chloroplasts intothe cell-sap. The palisade cellsare shown in cross section, as theywould be if the leaf were cutparallel with the surface, namely,tangentially. 142 CONSTRUCTION OF PLANTS FOOD
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