X The Biological Society of Washington. 



May 18, 1907 — 432d Meeting. 



The President in the chair and 35 persons present. 



W. W. Cooke discussed the spring migration of birds. 



W. P. Hay exhibited specimens of Peripatus. 



H. S. Barber named two additions to the known range of 

 Peripatus. 



Paul Bartsch reported the destruction of the inhabitants of an 

 aquarium l)y HydrophUus. 



A projection apparatus was exhibited and demonstrations 

 made of ordinary, micro, vertical, and opaque projection. 



October 19, 1907 — 433d Meeting. 



The President in the chair and 34 persons present. 

 The following communication was presented: 

 E. D. Merrill: The Geographic Distribution of Philippine 

 Plants. Discussions on the Distribution of Philippine Animals, 

 by L. Stejneger, M. W. Lyon, Jr., H. C. Oberholser, and The- 

 odore Gill. 



November 16, 1907 — 434th Meeting. 



The President in the chair and 45 persons present. 



M. W. Lyon, .Jr., Wm. Palmer, Miss E. G. Mitchell, and 

 A. B. Baker reported the capture of otters in the vicinity of 

 Washington. 



The following communication was presented : 



B. W. Evermann: Freshwater Mussels and the Pearl Button 

 Industry. 



December 14, 1907 — 435th Meeting. 



The President in the chair and 23 persons present. 

 The following communications were presented: 

 M.X.Sullivan: Toxic Bodies arising during Plant INIcta- 

 bolism. 



A. H. Howell: Notes on the Migration of Bats.* 



• Proc. Biol. Soc. Wasli., XXI, pp. 35-38, Jan. 23, 1908. 



