THE SELECTION OF A LOCATION 43 



be elevated considerably, and when a large tank is re- 

 quired, this is impracticable. The uncertainty of action 

 of a windmill also makes it objectionable. 



Where steam is used for heating, a small steam pump 

 may be bought for a comparatively low figure. This will 

 pump water from any well and gives excellent satisfaction. 

 In large ranges where a manure tank is used, the same 

 pump may serve to force both clear water and manure 

 water over the range. Such a pump of sufficient capacity 

 for 100,000 square feet of glass may be bought for less than 

 $400. 



A gasoline engine and pump would be somewhat cheaper, 

 and when hot-water is used for heating this would be re- 

 quired. Such an equipment can be used with a steel 

 expansion tank as an air chamber, so that the water can 

 be pumped directly into the pipe system at a pressure of 

 twenty-five, thirty or forty pounds to the square inch. 

 This should give sufficient pressure for syringing any 

 species of plants. 



The character of the water supply is of considerable 

 importance. That which comes from a city supply drawn 

 from an open reservoir is usually excellent. If it is pumped 

 from a near-by pond or river, it is usually highly satis- 

 factory. When taken from driven wells, the water is 

 often very cold and often lacks chemical constituents which 

 are beneficial as plant food. 



39. Atmospheric circulation. In the earlier days of 

 flower-growing, it was thought advisable to build green- 

 houses in valleys or where they were protected by wind- 

 breaks. It was also thought desirable to excavate and 

 sink them well into the ground so that the interior heat 

 might be conserved. These ideas have been largely 

 abandoned by prominent flower-producers of the present 



