1883.] NATURAL SCIENCES OF PHILADELPHIA. 321 



REPORT OF THE BIOLOGICAL AND MICROSCOPICAL 



SECTION. 



During the year eighteen meetings were held, with an average 

 attendance of about fifteen persons. 



The annual exhibition was held April 5, and was a success as 

 to the number of visitors and in regard to the improvement noticed 

 in general microscopical manipulation. 



The following gentlemen became contributors to the Section 

 during the 3-ear : — Dr. L. Brewer Hall, Dr. Henr3' Beates,Di-. Max 

 Bochroch, Dr. Charles L.Mitchell, Dr. M. B. Hartzell, Dr. Arthur 

 Wilson, Dr. William R. Hoch, Mr. John F. Lewis. 



The following resignations were accepted : — Dr. Charles Turn- 

 bull, Dr. S. H. Guilford. 



The meetings have been well supplied with material for discus- 

 sion, and an increased interest has been manifested during the 

 year. 



The following are some of the more important subjects brought 

 to the notice of the Section : — 



Dr. J. G. Hunt. — Communication upon Diatomes, Desmids, 

 Sponges, Carnivorous Plants, Mosses and on the Preparation 

 of Animal and Yegetable Tissues. 



Dr. Charles Mitchell. — A New Freezing Microtome. Also a 

 paper upon Hsematoxylon Staining. 



Dr. L. B. Hall. — Communication upon Spirogyra. 



Dr. G. A. Rex. — Upon the Trichias, with two rare forms not 

 found before in North America. 



Respectfully submitted, 



Robert J. Hess, M. D., 



Recorder. 



, REPORT OF THE CONCHOLOGICAL SECTION. 



The Recorder of the Conchological Section respectfully reports 

 that of the various papers upon the subject of the Mollusca, accepted 

 for publication by the Academy during the past year, the most 

 important was one by Mr. Andrew J. Garrett, of Tahiti, upon 

 " The Land Shells of the Society Islands," which is now in press 

 and will soon appear as a part of the Journal. 



