284 Gardening Under Glass 



devised than a rolling slat screen. Whitewash- 

 ing or some such brush-applied shading material 

 is of course freely practised, by commercial houses 

 especially, but it is unsightly and does not, more- 

 over, allow for the entrance of the sun when you 

 wish it to enter. In practice the wash is put on 

 the outside in early summer and the weather re- 

 moves it by late fall. 



Keeping Things JJ^arni 



The very heart and soul of the greenhouse is 

 its heating system. It will make no difference 

 how perfect its appointments and its construc- 

 tion, nor how skillful its attendant, nor how 

 beautifully it is planned, if its heating system 

 falls short. It is then a dead thing — as dead as a 

 tomb ! In greenhouse heating, as in all other, it 

 is desirable to provide for greater capacity than 

 the figures show will be actually needed, since 

 it is always more economical to run a fire in check 

 than under draft. Then, too, there may come, 

 once in a decade or so, a season of untoward 

 severity, during which only the excess heat that 

 has been figured on will save the night, if not the 

 day. 



Unquestionably it is a wonderful idea, this 

 greenhouse one of turning summer into winter 

 and temperate regions into tropical and convert- 



