324 VEGETABLE GARDENING 



"Our celery house is 50 by 150 feet, with walls 6]/ 2 

 feet high at the lowest corner, and about 4^ feet at the 

 upper side. The walls are 14 inches thick, made of con- 

 crete, with a 2 to 3-inch air space in the center. These 

 double walls are bound together by ^2-inch iron rods, 

 three to the square yard. 



"Twelve windows are in the side walls, just under the 

 plates or sills, while there are four in each end, just 

 above the sills. The top of the wall is level, and the 

 gable ends are of 7-inch studding, with flooring used on 

 both sides, the north end being packed with straw. The 

 painted iron roof is supported by 8-inch rafters, ceiled 

 underneath with flooring. This space is also packed with 

 straw or cheap hay. This roof is held up by 24 purlin 

 posts, set on concrete abutments. 



"The two double doors are large enough for a team to 

 enter. They are opened by raising, being balanced by 

 weight-boxes, hung over i6-inch sheave wheels. There 

 are two sets of ventilators in each end, about 20 inches 

 wide, and 12 feet long. These are double, hinged at the 

 top, one opening outward. This one is held at different 

 angles by ratchet irons, while the inside one buttons 

 either open or shut. There is also a ventilator I foot 

 wide the whole length of the roof, near the peak, on the 

 east side. On the upper side, these doors are covered 

 with iron roofing, and are held open or shut by ratchet 

 irons. The under doors drop down when open. 



"We have a walk in the center, two planks wide, on 

 purlin beams, for convenience in operating the ventila- 

 tors. The windows are in double sets, one outside of the 

 wall, and the other inside, each half sliding open or shut, 

 either to right or left. There is a brick chimney near 

 the center of the house, as we need a stove for keeping 

 an even temperature in very cold weather, and also for 

 heating water while washing the celery. We do not like 

 to let the temperature change very much, because 



