WALNUTS 183 



kinds of environment. We cannot be at all sure that 

 a valuable kind of Persian walnut from France, 

 China, or Brazil will adapt itself to the conditions 

 found in any one part of North America until we 

 have experimentally proved out the fact by the actual 

 raising of trees. On the Pacific coast of North 

 America, particularly, this work has been developed 

 with such a degree of enthusiasm that very many 

 varieties of the species stand for high value under 

 varietal names which have been given them. Among 

 thousands of seedling trees which have been raised 

 some are superior in certain respects to the parents 

 from which they sprang. 



California has taken the lead in walnut growing 

 with a climate and soil particularly well adapted to 

 the needs of the species. Mr. Carlyle Thorpe, of the 

 California Walnut Growers' Association, announced 

 for 1920 a walnut crop estimated at 46,000,000 

 pounds, having a value of $15,000,000. In addition 

 50,000,000 pounds of walnuts were imported during 

 the nine months preceding Mr. Thorpe's report. The 

 time is not far distant when the importation of wal- 

 nuts will be less than our production. Development 

 of the subject has been the outcome of careful selec- 

 tion of varieties, the determination of the best graft- 

 ing stocks suitable to northern and southern Cali- 

 fornia conditions and to cooperative marketing. The 

 latter feature is of great importance. The growers 

 of certain districts are responsible to a body of mar- 

 ket experts who take charge of the crop, attend 

 properly to grading and selection of the nuts and 



