GLOSSARY. 311 



Glaucous. Covered with a fine white powder, as that on a cab- 

 bage-leaf. 



Graffage. A system of propagation comprising all methods by 

 which plants are grown on roof^ of other plants. 



Grafting. The operation of inserting a scion in a plant. 



Grajtiiig-wax. A protective substance used in covering the junc- 

 tion of a graft with the stock or for the covering of wounds. 

 Bailey's formula for a reliable wax: Resin four parts 

 (by weight) ; beeswax two parts ; tallow one part. Melt 

 together and pour into a pail of cold water; then grease 

 the hands and pull the wax until it is nearly white. 



Hardy. Able to stand a given climate. 



Heeling-in. The operation and process of temporarily covering 

 the roots of plants to preserve them until wanted for per- 

 manent planting. 



Height classes. The arrangement of trees into classes according 

 to height. 



Herb. A x)lant not woody. 



Herbaceous. Not woody; said of plants that die to the ground 

 each year. 



Horticulture. The art and science of raising fruits, kitchen garden 

 vegetables, flowers, and ornamental trees and shrubs. 



Humus. Decomposed organic matter in the soil. 



Hybrid. Plant derived from a cross between plants of different 

 species. 



Hybridizing. The operation or practice of crossing between species. 



Hypsometer. An instrument for taking heights of trees. 



Inarching. The operation and process of uniting contiguous 

 plants or branches while the parts are both attached to 

 their own roots. 



Indeh^ scent. Not opening at regular lines; not dehiscent. 



Indigenous. Native; i.e., growing naturally in a given region. 



Inferior. Said of ovary when all the floral parts are attached 

 above it (e.g. Iowa Crab). 



Inflorescence. A flower cluster; mode of arrangement of flowers. 



Insecticide. A substance eniployed to destroy insects. 



Involucre. A bract or series of bracts subtending a flower-cluster 

 or fruit-cluster. 



Irregular. Said of flowers when the separate parts of each cycle 

 are not of the same size and shape (e.g. T-ocust). 



Jacob^s-staff, A pointed stafi* which may be pushed into the ground and 

 on which InAtrumenti} are mounted for taking observations. 



