xvi Thf biological Society of Washington. 



January 27, 1900 — 317th Meeting. 



The President in the chair and 30 persons present. 



William Palmer exhibited specimens of abnormal fern fronds. 



H. J. Webber exhibited specimens and photographs of aerat- 

 ing roots of Taxoditcm, Avicennia, Laguticularia, and Rhizo- 

 phora. 



O. F. Cook described a mangrove growing on dry land in 

 Africa. 



W. T. Swingle spoke of the occurrence of cypress knees in 

 Europe where Doctor Lotsy stated they were not formed. . 



The following communications were presented: 



T. A. Williams: Notes on a New Lecidea from Mexico. 



Barton W. Everraann: Some observations concerning Species 

 and Subspecies.* 



February 10, 1900— 318th Meeting. 



The President in the chair and 45 persons present. 



H. J. Webber exhibited a photograph of the tropical papaw 

 {^Garica papaya^. 



B. W. Evermann described the papaw as occurring in Puerto 

 Rico. 



The following communications were presented: 



Henry W. Olds: Form in the Songs of Birds. 



M. G. Kains: The Effect of the Electric Arc Light in the 

 Culture of Easter Lilies, f 



E. V. Wilcox: Lupines as Plants Poisonous to Stock. J 



February 24, 1900— 319th Meeting. 



The President in the chair and 8 persons present. 

 The following communications were presented: 

 W. A. Orton: The Sap-Flow of the Maple in Spring. 

 M. B. Waite: Michigan Peach Orchards. 8 



*Science, n. s., ii: 451-455. March 23, 1900. 

 fFlorists Exchange, Feb. 22, 1900. 

 t-Tour. Comp. Med. and Vet. Arch. 20: 666-774. 1899. 

 gReport Maryland State Hort. Soc. 2: 41. 



