292 HORTICULTURIST'S RULE-BOOK. 



annual layers or of the separation of the bark from the 



wood. The injury is commonly ascribed to the wind, but 



it is oftener due to frost and other causes. 

 Winter-killing. The process or act by which a plant is killed 



by the climate of winter. 

 Worm. A term properly applied to a large class of legless 



articulated animals of which the angleworm, or earthworm, 



and trichina, are examples. The term is commonly, but 



improperly, applied to the larvae of insects. 



