THE 



AMERICAN NATURALIST 



Vol. XLIII March, 1909 No. 507 



INVITATION PAPERS AT THE BALTIMORE 

 MEETING OF THE BOTANICAL SO- 

 CIETY OF AMERICA 



At the recent Baltimore meeting of the Botanical Soci- 

 ety of America, three series of special papers were read 

 by members who were specially requested by the council of 

 the society to prepare them for the occasion. 



The first set of papers dealt with certain phases of 

 recent advance in our knowledge of vascular anatomy 

 in plants. These papers, read on December 29, were by 

 J. M. Coulter and E. C. Jeffrey. 



The papers of the second series were read at a sym- 

 posium on "Present Problems in Plant Ecology," on 

 Wednesday, December 30. The participants were H. C. 

 Cowles, B. E. Livingston, C. H. Shaw, V. M. Spalding and 

 E. N. Transeau. 



The papers of the third series were read at the Dar- 

 win Memorial Session, held on Thursday, December, 31. 

 These addresses gave estimates of Darwin's work in 

 three fields of botanical investigation. The participants 

 were Wm. Trelease, F. E. Clements and H. M. Richards. 



In accordance with the instructions of the society, all 

 of the above mentioned papers are here published in full. 



Duncan S. Johnson, 

 Secretary. 



Baltimore, Md., February 1, 1909. 



DARWIN MEMORIAL SESSION 

 In response to a letter announcing the plans for the 

 Darwin Memorial Session, and suggesting that some 

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