DEHYDRATION IN CALIFORNIA 457 



since the beginning of American occupation) and owing to the 

 anticipated need of drying grapes because of prohibition of wine 

 making, there arose a great interest in machine evaporation in Cali- 

 fornia. This has been ministered to by inventors and by investiga- 

 tion of available appliances by the University Experiment Station, 

 of which publications are available describing the types of evapor- 

 ators and their operation. The subject promises to develop into 

 freer employment of artificial heat than has ruled hitherto in Cali- 

 fornia fruit curing, because the new types of evaporators have more 

 adequate capacity than those which were abandoned forty years 

 before and because oil has become available as a source of heat. 

 There is, however, no likelihood that the sun in the heavens will 

 ever be displaced as the chief agency in California fruit preservation. 



