Vol. XXI, pp. vm-xviii January 28, 1909 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGT 

 fas 



^mi 



PROCEEDINGS. 



The Society meets in the Assembly Hall of the Cosmos Club 

 on alternate Saturdays at 8 p. m. Brief notices of the meetings, 

 with abstracts of the papers, are published in Science. 



January 11, 1908 — 437th Meeting. 



The President in the chair and 100 persons present. 

 The following communications were presented: 



E. W. Nelson: Distribution of Plant and Animal Life on the 

 Peninsula of Lower California.* 



D. T. MacDougal: The Colorado River and Changes in its 

 Basin. 



January 25, 1908— 438th Meeting. 



The President in the chair and 75 persons present. 

 The following communications were presented: 

 W. P. Hay: Exhibition of Colored Lantern Slides by the 

 Autochrome Plates. 



F. V. Coville: The Probable Assimilation of Free Nitrogen 

 by the Swamp Blueberry (Vaccinium corymbosum) . 



W. W. Stockberger: Some Problems and Possibilities in Hop 

 Culture. 



February 8, 1908 — 439th Meeting. 



The President in the chair and 33 persons present. 

 H. W. Clark noted the occurrence and form of rain-traces on 

 Oriental plane-trees. 



The following communications were presented : 



L. O. Howard: Some New Parasitic Work. 



H. W. Clark: List of Plants for Aquatic Gardens. 



*To be published by Biological Survey. 



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