FROST PROTECTION. 359 



is most in evidence is a small portion where I have before 

 mentioned, and which had only one coal basket to five 

 trees. 



"In conclusion, I will say that after two years' careful 

 experience with coal baskets, I am more than ever con- 

 vinced that by careful, intelligent handling, we can save 

 our groves and fruit during our most severe freezes. We 

 concluded with 37 baskets to the acre, we were running 

 too close to the danger line, and have since doubled our 

 supply, and I would recommend that 75 to the acre be 

 used in groves that are subject to frost visitation. It is 

 not probable that it will be necessary to light all only in 



Fig. 81. Firing a California grove, using crude petroleum in 

 Froude's oil pots. 



extreme cases, but the extra insurance is well worth the 

 outlay. It is also certain that a small operator would not 

 get nearly as good results and should therefore have more 

 baskets to the acre. 



"My last word is, do not forget the importance of 

 knowing when to begin lighting. And if you will re- 

 member the pan of water it will save your nerves." 



The best, as well as the most commonly used recep- 

 tacle for firing with crude petroleum, is the Froude crude 

 petroleum pot. This has given good satisfaction in many 

 instances in California. Fig. 81 illustrates this pot in use 

 in protecting a citrus grove in California. 



