. A primer of forestry : part I, the forest. Forests and forestry. THE FOKEST. 25 all the trees, and often more than enough, as for example in the Adirondack forest. The struggle for space and light is thus more important "than the struggle for water, and as it takes place above ground it is also much more easily observed and studied. Light and space are of such importance because, as we have seen, the leaves can not assimilate or digest food except in the presence of light and air. The rate at which a tree can grow and make new wood is decided chiefly by its ability to assimilate and dig
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. A primer of forestry : part I, the forest. Forests and forestry. THE FOKEST. 25 all the trees, and often more than enough, as for example in the Adirondack forest. The struggle for space and light is thus more important "than the struggle for water, and as it takes place above ground it is also much more easily observed and studied. Light and space are of such importance because, as we have seen, the leaves can not assimilate or digest food except in the presence of light and air. The rate at which a tree can grow and make new wood is decided chiefly by its ability to assimilate and digest plant food. This power depends upon the number, size, and health of the leaves, and these in turn upon the amount of space and light which the tree can secure. THE LIFE OF A FOREST CROP. The story of the life of a forest crop is then largely an account of the competition of the trees for light and room, and, although the very strength which enables them to carry on the fight is a result of their association, still the deadly struggle, in which the victims are many times more in number than those which survive, is apt alone to absorb the at- tention. Yet the mutual help of the trees to each other is always going quietly on. Every tree continually comforts and assists the other trees, which are its friendly enemies. The purpose here is to follow the progress of a forest crop of uni- form age from the seed through all the succes- sive phases of its life until it reaches matu- rity, bears seed in its turn, and finally de- clines in fertility and strength until at last it passes away and its place is filled by a new generation. The life histor}^ which we are about to follow, as it unfolds itself through the course of several hundred years, is full of struggle 173. Fig. 19.—A White Pine seedling, showing the slender roots.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of th