GLOSSARY. 
Accretion. Growth or formation by external additions to the tree. 
Acorn. The fruit of an oak. 
Acuminate. Taper-pointed or long-pointed. (e. g. leaves of 
Willow.) 
Acute. Pointed. (e. g. leaves of Cork Elm.) 
Albumen. Food stored up in seed with embryo; endosperm. 
Alternate leaves. A single leaf at a node; not opposite. (e. g. 
Willow.) 
Altimeter. An instrument for taking grades, level and heights. 
Angle nurror. | Instruments for turning of angles in subdividing 
Angle prism. j land. 
Annual. Yearly; a plant which reaches maturity and dies at the 
end of a single season. (e. g. Pea, Wheat.) 
Annual ring. The layer of wood formed each year. (Page II.) 
Anther. The pollen-containing sac; enlarged part of stamen. 
Apetalous. Without corolla. (e. g. Soft Maple, Oak.) 
Arboreous. Tree-like. 
Assimilation. In plants, the production of organic matter from 
inorganic matter. 
Axil. The angle formed by the junction of the leaf-blade, bract, 
petiole, pedicle or peduncle, with the branch or stalk from 
which it springs. 
Back-firing. The burning, under control, of material in front of 
a fire to prevent its spreading. 
Bark. A general term applied to all the tissues outside of the 
wood proper. (Fig. 1.) , 
Basal. Attached to the base. 
Basal area. The cross-sectional area of a tree near the ground, 
usually taken about four and one-half feet above ground to 
avoid the excessive swelling of the root buttresses. 
* Bast. The woody fibrous tissue of the inner bark. (Page 355.) 
