ARTIFICIAL RIPENING 145 



through rapid incubation, which will require less than 

 a day and cost little. 



Finally, in localities with special problems, such 

 as the Salt River Valley of Arizona, special means may 

 be required, such as the use of carbon dioxid. This will 

 slightly increase the cost of handling the crop, but if 

 it makes date growing profitable instead of unprofit- 

 able, the grower need not complain; and in most 

 localities, even in Arizona, it is probable that suitable 

 varieties can be ripened without much trouble. 



