72 VEGETABLE GARDENING. 



inside to do all the work of caring for the plants. Figure 28 

 shows the general plan of the house. The size is 12x24 feet. 

 The roof consists of sixteen sashes, each 3x6 feet. Any number 

 of sashes may be used according to the size of the house desired. 

 To receive the most sunlight the house should extend north and 

 south; the light will then strike both sides of the plants. The 

 south end of the house is glazed from the surface of the bed up 

 to the rafters. It is not necessary to excavate the full depth 

 of four feet, because the earth that is thrown out can be used 

 to bank up with on either side, making a terrace as sloping as 

 desired. 



The heat is furnished by two to three feet of well prepared 

 manure in each bed, over which is placed five inches of soil. 



Fig-lire 29. — Sectional view of hotbed greenhouse. 



The sashes are fastened to the rafters by screws which prevents 

 their being lifted by heavy winds and at the same time allows 

 them to be removed very easily when desired to replace soil or 

 manure. Ventilation is provided for by fastening one or more 

 sashes with hinges at the bottom so they may be raiised as high 

 as necessary at the top. 



Many kinds of building material may be used in the con- 



