60 



thorough ventilation. There are five rows of shelves, 

 graduated to the slope of the glass ; they have a piece 

 an inch wide sawn out of the middle ; there is a space 

 also left between them ; so that the bottom of the 

 frame is quite open, for the abundant admission of 

 air to circulate thoroughly around the sides and bot- 

 tom of the pots. By letting down the front light 

 only, the plants may be left for days together, ex- 

 posed to all the advantages of light and air, without 

 care or notice, and when it is desirable to give them 

 the benefit of a shower remove the top lights. The 

 following is an end view of the frame, which, by 



measurement, is 4 ft. 8 in. at the back ; 3 ft. 8 in. in 

 front ; 3 ft. 8 in. in depth, from front to back ; and 

 15 in. from the shelves to the glass top light: the 

 rise between the shelves is two inches, and the whole 



