CHAPTER XV. 



CULTURE UNDER GLASS. 



LASS HOUSES are in use for two purposes : first, 

 as a protection for varieties which are otherwise 

 too delicate to ripen well in our climate ; and, secondly, 

 for the purpose of ripening fruit out of the natural season. 

 For the first purpose, a veiy slight protection is "all that is 

 essential. The Black Hamburg, and many other of the 

 more vigorous European varieties, are found to ripen per- 

 fectly under a roof of glass ; the back of the house being 

 left entirely open throughout the season. Indeed, they 

 have ripened well under single sashes left open on all 

 sides. So simple is the requirement, that every house- 

 holder may have foreign grapes growing under a tempo- 

 rary roof of sashes, with none of the care of ventilation ; 



