n 



THE DEHISCENCE OF ANTHERS BY APICAL PORES. 169 



J. C. Willis, Royal Botanic Gardens, Ceylon; Dr. M. 

 Treub, Jardin Botanique, Buitenzorg; Dr. J. H. Maiden, 

 Government Botanist, Sydney, N. S. W. ; Dr. I. Urban, 

 Koniglicher botanischer Garten und Museum, Berlin; 

 Dr. T. Durand, Jardin Botanique de Tfitat, Bruxelles; and 

 Dr. N. L. Britton, New York Botanical Garden. 



This material, which was asked for only after the most 

 of the data for this paper had been gathered and classi- 

 fied, has been consulted in the preparation of these pages 

 but is being used mainly for a histological investigation of 

 these types of anthers, and so my future memoir will owe 

 even more to their generosity than the present one, which 

 is very largely a library contribution. Perhaps nowhere 

 else could this paper have been prepared so easily as at 

 the library of the Missouri Botanical Garden, with its large 

 collections of living and preserved plants also accessible for 

 consultation, and I wish to express my gratitude to the 

 Director, Dr. William Trelease, not only for access to 

 these facilities, but for the most generous conditions 

 under which I have used them while connected with 

 the Garden and with Washington University. For 

 everal months Mr. Dean H. Rose has assisted me 

 in this and in other research work, and while the most 

 of his time has been given to phases of the subject which 

 will be treated later, I wish to express in advance my 

 hearty appreciation of the earnest and efficient service he 

 has given me. My sister, Miss Nellie L. Harris, has been 

 of great help to me in the preparation of the statistical 

 portions of the paper. 



n 



EARLIER INVESTIGATIONS. 



That in a comparatively limited number of Phanero- 

 gams, the pollen is shed through terminal pores instead of 



r> 



general 



genera 



species 







