Proceedings. xix 



Walcott, Dr. Merriam, Dr. Stejneger, Professor James, Dr. 



Dall, Professor Riley, Mr. Ferxow, and Mr. Coville. 



Charles Hallock (read b}^ Mr. Lucas) : " The Physiology of a 



Pocoson." Discussed by Mr. Waite aiid Mr. AVilliam Palmer. y 



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 l^r. Reyburn, Mr. Fernow, Professor Riley, Mr. 

 McGee, Dr. Dall, Dr. ^L-:rriam, and Professor Ward. 



C. D. Walcott : " On the Discoveiy of Certain Cambrian Fos- 

 sils on the Coast of Massachusetts." ^ 



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

 Field." - Discussed by Professor Ward, Mr. Walcott, and Mr. 

 Knowlton. 



C. W. Stiles : " Notes on Parasites — Sirongyhts rubidiis.''^ ^ 



Aj>ril 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 Hlcoria 

 Pecan.'''' Discussed by Professor Seaman, Professor Ward, Mr_ 



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

 Soc. Wasli., vol. vii, July 27, 1892, p. 155. 



■■^The Fossil Flora of tlie Bozeman Coal Field. Proc. Biol. Soc. Wash., 

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



•^Albert Hassall and C. W. Stiles: Strongylus rubidas, a new species of 

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

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



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



