30 



GREENHOUSES 



GABLE ROOF SASH-BEDS 



Sometimes hotbeds and coldframes are 



made of two rows of sash set so as to form 



a gable roof. They have few advantages 



and many disadvantages when compared 



Fig. 16. Gable roof sash-bed heated by manure 



with those of the ordinary type. A few 

 years ago it was quite common to find sash- 

 beds of this kind with a sunken walk under 

 the ridge in which the workman could stand, 

 the heat being supplied by decaying manure 

 the same as in an ordinary hotbed. Such 

 beds are convenient to operate in planting, 

 watering and cultivating, especially in cold 

 weather. They are not a profitable venture 

 as a rule, as heat can be supplied more cheap- 

 ly from coal than from manure. When an 

 investment has been made in a house of this 



