. The elements of forestry : designed to afford information concerning the planting and care of forest trees for ornament or profit and giving suggestions upon the creation and care of woodlands with the view of securing the greatest benefit for the longest time, particularly adapted to the wants and conditions of the United States. Forests and forestry. Structure and Functions of the Leaves. 65 cells of chlorophyll; I are air spaces; u, minute masses of chloro- phyll, thus brought in near contact; and sp, " stomata," or breathing pores, through which the air enters. These pores are
. The elements of forestry : designed to afford information concerning the planting and care of forest trees for ornament or profit and giving suggestions upon the creation and care of woodlands with the view of securing the greatest benefit for the longest time, particularly adapted to the wants and conditions of the United States. Forests and forestry. Structure and Functions of the Leaves. 65 cells of chlorophyll; I are air spaces; u, minute masses of chloro- phyll, thus brought in near contact; and sp, " stomata," or breathing pores, through which the air enters. These pores are chiefly. 49. Vertical Section of a Beech Leaf, very greatly enlarged. on the under side of the leaf, and vary in number from 1,000 to 170,000 to a square inch. In coniferous leaves there is no network of ribs, but a longitudinal and sometimes a diverging system of fibers. A'cross-section shows a symmetrical arrangement of cells, some filled with grains of chlorophyll, others with air, and others with resinous matter. The arrangement of these cells is constant within genera, and to some extent in species, afibrding character- istics upon which classifications have been formed. The stomata upon coniferous leaves arc more abundant upon the under and lighter colored side of the leaves, but iu some cases where both sides are colored alike, they are found equally on both sides. The ginkgo (SaMiAaria adiantifolia)), one of the Japanese species that is found to thrive in the Middle and Southern States, is a conifer with very exceptional form of leaf. It spreads out flat like a fan, and is de- ciduous. 237. The moisture of the soil, is brought up in the form of sap from the roots to the leaves, bearing in solution certain mineral and organic materials. These are then exposed to the air, and to the carbonic acid in the air, and under the action of the light the latter is decomposed. Its carbon is retained and oxygen given out. A' vast amount of evaporation also takes place from the leave
Size: 1850px × 1351px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectforestsandforestry
