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 mirror. ^ Instruments for turning of angles in subdividing 

 Angle prism. \ 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 n.) 

 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. i.) 

 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.) 



