454 



The Principles of Fruit-growing. 



approximate somewhere between 50 and 55 Fahr. during the 

 entire year. The above statement is based upon the observed 

 temperature of perennial springs in this vicinity. 



"From the foregoing it follows that if the air in the cellar 

 becomes warmer than the air in the underground flue, it will 

 rise through the ventilating flues, and the colder air will flow in 

 from the supply fl'ie, as desired. The temperature of the cellar 

 room can thus be approximately controlled to at least the 

 neighborhood of 55 to 60 Fahr. The construction of the cellar 

 is shown somewhat in detail in the drawings below. These 

 figures are not intended as working drawings, but serve to 

 bring out the essential ideas and plan of the structure suffi- 

 ciently to enable any mechanic to carry them out on larger or 

 smaller scale to suit the needs of the builder. Fig. 113 is a 



Fig. 113. Longitudinal section of Alwood's house. 



longitudinal section through the cellar room, and shows also a 

 side elevation of the storeroom above. The two ventilators a a 

 rise through the storeroom, and are six inches in diameter by 

 fifteen feet long, thus insuring good draft. The air flue 6 



