Proceedings. ix 



William Palmer : The Type (?) of a New Old Species. 

 Sylvester D. Jiidd : Sexual Dimorphism in Crustacea. 



March 27, 1897— 274th Meeting. 



The President in the chair and 30 persons present. 

 The following communications were presented : 

 M. B. Waite : Factors Governing Pear Blight.* 

 E. A. De Schweinitz: Some Methods of Generating Formal- 

 dehyde and its Use as a Disinfectant.f 



Theo. Holm : The Grass Emhryo and its Constituents.]: 



April 10, 1897— 275th Meeting. 



Ex-President W. H. Dall in the chair and 31 i)ersons present. 



The following communications were presented : 



Theo. Gill and C. H. Townsend : Diagnosis of Deep-sea 

 Fishes. ( Read by title.) § 



Jonathan Dwight, Jr. : A Species of Shearwater (Pvffinus as- 

 shnilis Gould) New to the North American Fauna.|| 



Sylvester D. Judd : Antennal Circulation in Crangon3'x. 



Charles T. Simpson : Notes on the Classification of Unios.^ 



H. C. Oberholser: The American Golden Warblers. 



T. Wayland Vaughan : Notes on a Monograph of the Eocene 

 Corals of the United States. 



April 24, 1897— 276th Meeting. 



Ex-President W. H. Dall in thecludrand 31 persons })resent. 



Edward L. Greene exhibited and commented upon specimens 

 of Viola emarginata and V. heterophylla. 



The following communications were presented : 



M. A. Carleton: Climate as an Element in Wheat Environ- 

 ment. 



* Substance in article entitled ' Cause and Prevention of Pear Blight.' 

 <Yearbook U. S. Dept. Agric. for 1895, pp. 295-300, 1890. 



t Journal of the American Public Health Association, October, 1896 (in 

 part). 



J Am. Journ. Sci., iv, pp. 13-26, July, 1897. 



§Proc. Biol. Soc. Wash., xi, pp. 231-234, September 17, 1897, 



II Proc. Biol. Soc. Wash., xi, pp. 69-70, April 21, 1897. 



i Nautilus, xi, pp. 18-23, June, 1897. 



U— Biol. Soc. Wash., Vol. XI, 1897. 



