152 



GARDENING FOB PLEASURE. 



portance with heat, for if this is not attended to, you 

 may expect red-spiders and thrips, and then all your labor 

 may be in vain ; to keep up this moisture, tanks are usu- 



Fig. 62. ELEVATION OF FBONT OF FORCING GBAPEBT (IN PABT). 



Fig. 63. SECTION OF FORCING GBAPEBT. 



ally placed on the hot- water pipes for graperies, and these 

 are kept filled with water, keeping up a continued evap- 

 oration, except at the time the vines are in flower ; it 



