382 BOARD OF AGRICULTURE. [Pub. Doc. 



For success, some of the conditions that must be provided 

 are as follows : — 



Location. — Glass houses should be located where the 

 greatest amount of sunshine shall be obtained during the 

 months of December and January, and be as much sheltered 

 from the north and north-west winds as possible. 



Drainage. — It is xevj important that the most perfect 

 drainage be obtained ; that there be no standing water in 

 any })art of the house or near the surface of the ground 

 inside ; that water used or coming into the house shall 

 drain away quickly. Surface drainage should be provided 

 by surface and under drains about the building, so that 

 during heavy rain storms the surface water shall run away 

 from the building, and not toward or into it. 



Water. — Water supply, with a head of at least forty 

 feet, is a necessity for the best results. This should come 

 from cisterns or reservoir, and not from wells. 



Construction. 



Greenhouses can often be built in the country cheaper 



than in the city, as materials like lumber, stone, etc., can 



often be obtained at a less cost than in the city, and if the 



owner is at all skilled in the use of wood-working tools, he 



can do much of the work upon the common greenhouse 



structure. 



Kinds of Greenhouses. 



The form of greenhouse to be built must depend some- 

 what upon the location and the kind of crop to be grown, 

 though the modern greenhouses of all forms are so con- 

 structed, with light sash bars and large glass, as to provide 

 ample light, and success with any of them depends more 

 upon the amount of heat supplied and the skill of the 

 groAver than anything else. Most of the modern houses for 

 all kinds of crops under glass are lean-to or three-quarters- 

 span houses, facing the south, south-east or south-west, 

 though some very good even-span rose houses are built 

 that give very good results. 



The simplest structure that would havC much value for 

 commercial purposes is the lean-to house (Fig. 1). This 



