13 



the lowest level, in fact immediately over the piping, 

 the moist air becomes condensed, and instead of pro- 

 ceeding to the roof to form drip, passes at a low 

 level through the body of the house. 



One caution is necessary here, at least with regard 

 to vines, and that is to empty the gutter the first 

 thing every morning, for fear of scorching or blis- 

 tering the vines. This may be easily effected by 

 having a tap or plug at one end, and communicating 

 immediately with the main vine-border drain ; and 

 by pulling out the plug the gutter will be emptied in 

 a few minutes. This mode is far preferable to the 

 open gutter, inasmuch as it is under the most perfect 

 control, without the trouble of moving covers. 



Glass. — This should be of the best manufacture, 

 for just in proportion to its goodness of quality is the 

 freedom with which the rays of light pass through, 

 and a plant performs its digestive and assimilating 

 processes the nearer to the vigour with which it ef- 

 fects them in a state of nature, just in proportion as 

 the light it basks in is similar to that of its native 

 habitat. But this is not the only reason why good 

 glass should be employed in our garden structures ; 

 for whilst panes of common crown glass readily break 

 from frost or the slightest twist of the wood-work, 

 good sheet glass will remain uninjured by much 

 greater violence and by the fiercest hailstorms. Some 

 injury from the last, however, will always arise, and 



