Greenhouses, their construction and equipment . Fig. 16.—Gable roof sash-bed heated by manure with those of the ordinary type. A fewyears ago it was quite common to find sash-beds of this kind with a sunken walk underthe ridge in which the workman could stand,the heat being supplied by decaying manurethe same as in an ordinary hotbed. Suchbeds are convenient to operate in planting,watering and cultivating, especially in coldweather. They are not a profitable ventureas a rule, as heat can be supplied more cheap-ly from coal than from manure. When aninvestment has been made in a house of this SA
Greenhouses, their construction and equipment . Fig. 16.—Gable roof sash-bed heated by manure with those of the ordinary type. A fewyears ago it was quite common to find sash-beds of this kind with a sunken walk underthe ridge in which the workman could stand,the heat being supplied by decaying manurethe same as in an ordinary hotbed. Suchbeds are convenient to operate in planting,watering and cultivating, especially in coldweather. They are not a profitable ventureas a rule, as heat can be supplied more cheap-ly from coal than from manure. When aninvestment has been made in a house of this SASH-BED CONSTRUCTION 31 type it will be found to be economy to equipit with an inexpensive hot water system. MATS AND SHUTTERS Hotbeds and coldframes, when used in climates or seasons in whichthe temperature is likely to fall much below freezing, must be provided with supplementary ?^i- A
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