Preface. 



The following leading authorities, among others, have been consulted 

 in the preparation of this work : 



1 . California Fruits and How to Grow Them , by Edward J. Wickson, 



A.M., San Francisco, 1900. 



2. Citrus Fruit Growing in the Gulf States ; by P. H. Rolfs ; Farmers' 



Bulletin No. 238, U. S. Department of Agriculture. 



3. Citrus Fruit Culture / by J. W. Mills ; Bulletin No. 138, University 



of California, Agricultural Experiment Station, Sacramento, 1902. 



4. Twenty-second Report of the Agricultural Experiment Station of the 



University of California, Sacramento, 1904. 



5. Annual Report of the Porto Rico Agricultural Experiment Station, 



1904; by D. W. May; U. S. Department of Agriculture, Office 

 of Experiment Stations. 



6. Propagation and Marketing of Oranges in Porto Rico; by 



H. C. Henricksen ; Bulletin No. 4, Porto Rico Agricultural 

 Experiment Station ; Washington, 1904. 



7. Citrus Fruits in Hawaii ; by J. E. Higgins ; Bulletin No. 9, 



Hawaii Agricultural Experiment Station ; Washington, 1905. 



8. Pomelos; by H. Harold Hume; Bulletin No. 58, Florida Agricul- 



tural Experiment Station ; Jacksonville, Fla., 1901, 



9. El Naranjo ; por el Dr. B. Alino ; Valencia, 1900. 



10. Tratado complete del Naranjo; por Prof. B. Giner Alino; Valencia, 

 1901. 



JOSEPH HILLMAN. 



London, January, 1907. 



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