VOL. XXVII July, 1926 No. 319 



JOURNAL 



OF 



The New York Botanical Garden 



MORPHOLOGY OF POLLEN GRAINS IN RELATION TO PLANT 



CLASSIFICATION 



R. P. WODEHOUSE 



WHY ARE CHESTNUTS SELF-FRUITLESS? -^^^^ 



A. B. Stout 



THF PERFUME OF NARCISSI (DAFFODILS) 



Ethel Anson S. Peckham 



VARIATION, HEREDITY, AND ENVIRONMENT IN RELATION TO 



EVOLUTION 



Albert F. Blakeslee 



THE DESERT VEGETATION OF THE SOUTHWEST 



John W. Harshberger 



THE PLANTING OF FLOWER SEEDS 



George Friedhof 



NOTES, NEWS, AND COMMENT 

 ACCESSIONS 



Published for the Garden 



At Lime and Green Streets, Lancaster, Pa. 



The Science Press Printing Compaky 



Entered at the post-offlce in Lancaster, Pa., as second-class matter. 



Annual subscription $1.00 Single copies 10 cents 



Free to members of the Garden 



