FROST PROTECTION. 347 



In cold regions where soil conditions are suitable, 

 the hardier stocks should always be given the preference. 

 A slight gain in hardiness, due to the influence of the 

 stock on the cion, may frequently be as effective as a de- 

 cided gain. 



HARDY VARIETIES. 



A decidedly hardy stock we already have. If a va- 

 riety could be secured, equally as hardy, total immunity 

 from frost would be secured throughout the whole of the 

 citrus regions. The attempt to secure such a variety has 

 been made by Dr. H. J. Webber. Some measure of suc- 

 cess has been attained and further results may be expected 

 from this work. 



But, while we may look to the final outcome of these 

 investigations and experiments with some degree of hope, 

 we must not lose sight of the fact that for many, many 

 years to come, the citrus growers must depend upon the 

 varieties we now have for the continued prosperity of their 

 industry. 



Some varieties of citrus fruits, fortunately, are con- 

 siderably hardier than others. Satsuma is the hardiest 

 of the mandarin group, and the hardiest known large- 

 fruited, edible citrus. Duncan is the hardiest of the pom- 

 elos, Tresca being one of the most tender. Duncan is 

 equally hardy with most of the sweet oranges, in fact, 

 there appears to be but little difference between them. 

 The Marumi kumquat is decidedly hardier than Nagami. 

 In the lemon group, but little opportunity has been af- 

 forded for observation. Slight differences probably exist. 

 Villafranca is apparently quite hardy. Of the sweet or- 

 anges, Jaffa and Ruby are hardier than some others, 

 though a number of others are quite as hardy as they are. 



