CLIMATOLOGY 31 



fire pots have to be lighted. If there are several 

 acres of orchard with 50 to 100 pots to the acre, this 

 becomes somewhat of a chore of itself, as the work 

 has to be done rapidly and at two or three o'clock in 

 the morning when the land is apt to be dark and 

 the work otherwise unpleasant. Special lighting 

 torches have been patented and are offered for sale, 

 and these are probably well worth while. At any 

 rate it would be found very trying to strike a sep- 

 arate match for each fire pot. 



This method of orchard heating has apparently 

 come to stay. In all those regions where there is 

 constant danger of late spring frosts and where con- 

 ditions are otherwise favorable, this seems to be 

 the most certain and economical method. Some- 

 thing depends, however, upon the topography, upon 

 the presence of currents of air and other local con- 

 ditions. A good deal remains to be learned about 

 orchard heating, and even after the general princi- 

 ples are better understood than they are today, there 

 will always be need of careful adjusting of the 

 methods to the requirements of each particular 

 orchard. 



