Fig. 2. Cross section of a typical ^ist in subiirigation 

 even span double glazed cucumber ^ 



The most common type of house used 

 is shown in figure 2. This house is espec- 

 ially built for cucumber growing i^nd 

 would not be adapted to lettuce. Houses 

 of this type are furnished with beds con- 

 taining about one foot of soil, in whjch 

 is usually buried 2-inch porous tile for 

 This type of house 

 house,2oft.byio6ftTNo.3in table I. Js usually 15 to 23 feet in width 

 and from 100 to 200 feet in length. Many of these houses are 

 provided with two layers of glass throughout, a space of i^ or 2 

 inches being left between the layers. Sn^all ventilators are placed 

 near the top of vhe roof but seldom on the sides. Some of these 

 houses are built with heavy wooden frames which, together with the 

 small and inferior glass frequently used, results in rendering light 

 conditions too poor for the production of healthy plants or large 

 crops. The outer row of plants is trained to follow up the sides and 

 roof, and, when the house is 18 to 23 feet in width, one or more 

 rows are planted through the middle. The middle rows are necessa- 

 rily more shaded, and invariably prove of little value as crop pro- 

 ducers in double glass houses. 



Fig. 3. Cross section of house used for cucumbers, 36 by 200 ft. No. 10 in table 1. 



The style of house shown in figure 3 is less frequently devoted 

 to cucumbers, but occasionally such houses are made use of for that 

 purpose. It is, however, a typical lettuce house, the highest side 

 being boarded. The method of training the plants is shown in the 

 illustration and is different from that practiced in regular cucumber 

 houses. This method of training is generally adopted in houses of 

 this type. 



