GREENHOUSE AND WINDOW-GARDEN WORK. 165 



fuchsia, and carnation. Those which are nearly exempt are 

 most kinds of geraniums, begonias, wandering Jew, and most 

 ferns. (For insects, see p. 17.) 



19. Vegetables used for Forcing under Glass. 



Asparagus. 



Bush Bean. 



Carrot. 



Cauliflower ; generally matured 



Lettuce. 



Muskmelon ; generally grown 



as a late fall or late spring 



crop. 



under glass, as a late spring Parsley. 



crop. Pea. 



Cress. Radish. 



Cucumber ; there are two types Rhubarb. 



of forcing cucumbers, the Sweet herbs, 



common, or White Spine spearmint. 



type and the English or Tomato. 



frame varieties. 



particularly 



Lettuce, tomato, cucumber, asparagus, and bean are gener- 

 ally the most profitable forced crops in this country, in about 

 the order named. 



20. Twenty- five Useful Aquatic and Sub-aquatic Plants for 

 Out-door Use. 



T denotes those which do not endure the -winter. 



Acorus gramineus, variegated. 

 Aponogeton distachyum. 

 Azolla Caroliniana. 

 Caltha palustris. 

 Cyperus alternifolius ; t. 

 Eichhornia crassipes or azurea, 



(properly E. speciosa) ; t. 

 Limnanthemum Indicum ; t. 

 " nymphoides. 



Limnocharis Ilumboldtii (Hy- 



drocleys Commersonii) . 



Myriophyllum proserpinacoi- 

 des; t. 



Nelumbium (Nelumbo). Many 

 species and varieties. Some t. 



Nuphar advena. 



Nymphsea. Many species and 

 varieties. Some t. 



Ouvirandra fenestralis (Apono- 

 geton feiiestrale) ; t. 



Papyrus ( Cyperus Papyrus) ; t. 



