230 The Principles of Vegetable - Oardening 



this enclosed lower temperature reraain for a time at a point more 

 nearly that desired. 



"In Figs. 56 and 57 is shown one of the most improved root 

 houses which I have seen in operation, and the photograph here 



Fig. 58. 



Details of construction of 

 a good storage house. 



reproduced was taken on the premises of Abra- 

 ham Franke, Irondequoit, N. Y. With the usual 

 excavation of eighteen inches or two feet, this 

 structure has a brick foundation, and the roof is 

 well provided with air-chambers and paper linings, affording the 

 best protection against cold. The additional large air-chamber 

 above the collar-beams, with its separate windows, seems also 

 desirable. There are large double doors at each end, and the 



