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UNITED STATES DEPARTMENT OF AGRICULTURE 



BULLETIN No. 223 



Contribation from the Bnrean of Plant Indnstry 



WM. A. TAYLOK, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



June 23. 1915. 



BOTANICAL CHARACTERS OF THE LEAVES OF 

 THE DATE PALM USED IN DISTINGUISH- 

 ING CULTIVATED VARIETIES 



SILAS C. MASON, Arboriculturist, Crop Physiology and 



Breeding Investigations 



CONTENTS 



Page 



Introdaction 1 



The Date Tree 3 



Leaf Characters of the Dale « . . . . 3 



Use of the Field Protractor 13 



Page 

 Forms for the Obsenrer'a Use .... 13 

 Application of the System to the Deglet 

 Noor Variety and Its Seedlings ... 16 





OK 4 



.F2I 



W35 





WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1915 



.-£. 



