Foretelling Frosts. 121 



vens, 011 the same occasion, reports success in sav- 

 ing orange trees from cold by burning rosin, secur- 

 ing both heat and smoke. He makes cones six 

 inches high and six wide of common hardware paper 

 which lias received a coat of paint. These cones 

 are filled with cheap rosin and set near the trees. 

 A little of the rosin is pulverized on top, and it 

 is then set on fire from a bit of oiled waste which 

 is dropped on it. Six pounds of rosin burn about 

 an hour. 



THE PREDICTION OF FROST. 



In considering the means of predicting frost, it 

 is first of all important that the student should ob- 

 tain a clear idea of the usual or average dates of 

 the opening and closing of the seasons of his locality. 

 Records made by himself upon his own farm from 

 year to year are invaluable. He may derive very 

 much help, also, from the records of meteorological 

 bureaus. A general tabulation of spring and fall 

 seasons (see pages 123 and 124) may be suggestive 

 in this connection:* 



"The data for the accompanying tabulation of 

 the killing frosts of the region east of the Rocky 

 Mountains was compiled from the bulletins and an- 

 nual reports of the United States Weather Bureau. 

 The table is divided into dates for spring and fall, 

 and these in turn into earliest, latest, and average 



*Made by Alexander D. MacGillivray, Assistant in Entomology, Cornell Uni- 

 versity. 



