Tree increases each year in height and spread ofbranches by adding on new growth of twigs

Air supplies carbon the principal food of the treetaken in on under surface of leaves.

Leaves prepare the food obtained from air and soiland give off moisture by transpiration. Light and heatare necessary for the chemical changes

The breathing pores of the entire tree,—on leaves,twigs, branches, trunk and roots take in oxygen.Flooding, poisonous gases, or smoke may kill a tree

Root tips or root hairstake up water containing small quantity of minerals in solution

The buds, root tips, and cambium layer are the growing parts of the tree.Water containing a small quantity of minerals in solution is absorbed by theroots, carried up through the sapwood to the leaves and there combinedwith carbon from the air to make food. This food is carried by the innerbark to all growing parts of the tree, even down to the root tips

ACKNOWLEDGMENTS

The first edition of Forest Trees of Texas—How to KnowThem was assembled by W. R. Matoon and C. B. Webster in1928. The sections, “Trees as Mankind’s Friends”, “Studyinga Tree”, “Other Texas Trees”, drawings of twigs, leaves andfruits, and the glossary were incorporated into the fourth andfifth editions by S. L. Frost and D. A. Anderson. The sixthand seventh editions were edited by H. E. Weaver and W. A.Smith, respectively. Some of the drawings used in this publicationwere made available by the United States Forest Service.

The eighth edition was revised and edited by John A.Haislet to conform with the nomenclature in Check List ofNative