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 fine, 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 seale to suit the needs of the builder. Fig. 113 is a 
fle fle 
SANE eben 
ws 
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 b 
