!68 THE NURSERY-BOOK. 



cool house under a hand-glass in spring, and when calloused, 

 introduced to gentle bottom heat. 



Correa. Rutacece. 



Seeds. May be propagated by cuttings very readily. Va- 

 rieties are usually grafted on C. alba. 



Cortusa (Bear's-ear Sanicle). Primulacece. 



Increased by seed sown as soon as ripe in a cold-frame ; 

 also by carefully dividing the roots. 

 Coryanthes. See Stanhopea. 

 Corydalis. Ftimariece. 



Increased by seeds, or by dividing the plants directly after 

 flowering. The bulbous-rooted species by offsets. 



Corylus (Hazel ; Cob-nut). Cupuliferce. 



Propagated by seeds, suckers, layers or cuttings. Grafting 

 and budding are each practicable, and are adopted when 

 growing tall standards or scarce varieties. The seed of all 

 should be sown as soon as gathered, or stored in sand till the 

 following spring. All superior varieties should be increased 

 by suckers or layers. Stools kept for layering must be allow- 

 ed to make more growth than those used for suckers. Free 

 growth must be encouraged for a year or more, and, any suit- 

 able time in winter, the shoots should be bent to the ground, 

 pegged firmly, and covered to the depth of three inches with 

 earth. They will be well rooted by the following autumn, 

 and may then be removed and planted out permanently. 



Corynostylis, Calyptrion. Violariece. 



Increased by seeds, or by cuttings of the young wood, 

 placed in sand in bottom heat, under glass. 



Cosmos. Compositce. 



Seeds, usually started under glass. The tuberiferous spe- 

 cies, like Dahlia, which see. 

 Costus. Scitaminece. 



Increased by dividing the roots. 

 Cotoneaster. Rosacece. 



Propagated readily by seed, which should be sown in 

 spring ; by layers or cuttings in autumn, or by grafting on 

 C. vulgaris, the common quince, or the hawthorn. 

 Cotton (Gossypiui/i). Malvaceae. 



Seeds commonly. Grown as a curiosity under glass ; it 

 may be increased by soft cuttings. 



