Proceedings. xix 



WALCOTT, Dr. MERRIAM, Dr. STEJNEGER, Professor JAMES, Dr. 



DALL, Professor RILEY, Mr. FERNOW, and Mr. COVILLE. 



CHARLES HALLOCK (read by Mr. LUCAS) : " The Physiology of a 



Pocoson." Discussed by Mr. WAITE and Mr. WILLIAM PALMER. 

 VERNON BAILEY : " The Homes of Our Mammals." 

 THEODOR HOLM : " The Flora of Nova Zembla." Discussed 



by Mr. SWINGLE. 



March 19, 1892. 191st Meeting- 



The PRESIDENT in the chair and 70 persons present. 



COMMUNICATIONS. 



LESTER F. WARD : " The Biological Basis of Psychology." 

 Discussed by Dr. REYBURN, Mr. FERNOW, Professor RILEY, Mr. 

 McGEE, Dr. DALL, Dr. MERRIAM, and Professor WARD. 



C. D. WALCOTT : " On the Discovery of Certain Cambrian Fos- 

 sils on the Coast of Massachusetts." l 



F. H. KNOWLTON : " The Fossil Flora of the Bozeman Coal 

 Field." 2 Discussed by Professor WARD, Mr. WALCOTT, and Mr. 

 KNOWLTON. 



C. W. STILES : " Notes on Parasites Strongylus rubidus." 3 



April 2, 1892. 192d Meeting. 



The PRESIDENT in the chair and about 65 persons present. 



COMMUNICATIONS. 



C. V. RILEY : " The Interdependence of Plants and Insects." * 

 Discussed by Professor WARD, Dr. GILL, and Professor RILEY. 



C. HART MERRIAM : " The Distribution of Tree Yuccas." Dis- 

 cussed by Mr. GILBERT, Mr. COVILLE, Mr. VAN DEMAN, Mr. HAS- 

 BROUCK, and Professor RILEY. 



H. E. VAN DEMAN : " Variations in the Fruit of Hicoria 

 Pecan." Discussed by Professor SEAMAN, Professor WARD, Mr, 



1 Note on Lower Cambrian fossils from Cohassett, Mass. Proc. Biol. 

 Soc. Wash., vol. vii, July 27, 1802, p. 155. 



2 The Fossil Flora of the Bozeman Coal Field. Proc. Biol. Soc. Wash., 

 vol. vii, July 27, 1892, pp. 153, 154. 



3 Albert Hassall and C. W. Stiles : Strongylus rubidus, a new species of 

 Nematode, parasitic in pigs. The Journal of Comparative Medicine and 

 Veterinary Archives, 1892, pp. 207-209, figs. 1-3. 



4 Proc. Biol. Soc. Wash., vol. vii, May 28, 1892, pp. 81-104. 



