NATURAL RCTENCES OF PHILADELPHIA. 233 



by Mr. S. D. F. Kohler ; Amber, from New Jersey, by Dr. H. O. 

 Hyatt; do., by Col. T. aM. Bryan; Salt, by H. T. Darlington; 

 Breunerite, by C. F. Parker ; Livingstonite, from Mexico, by Sr. 

 Mariano Barcena ; and Limonite, Analeime, Stilbite, Heulandite, 

 and Cacholong, by Dr. Leidy. 



The collection of Minerals of the late Dr. Adam Seybert has 

 been deposited in the Academy b}' Mr. Henry Seybert. 

 Respectfully submitted by 



Joseph Leidy, 

 Chairman of Curators. 



REPORT OF RECORDER OF BIOLOGICAL AND 

 MICROSCOPICAL SECTION. 



December 7th, 1874. 



In reviewing the events of our microscopical year, I think we 

 may find just cause for mutual congratulation, in the fact, that 

 although the number of original papers presented before the Sec- 

 tion has been less than on some previous occasions, yet we have 

 in the past twelve months done more than almost ever before, to 

 popularize a knowledge of the wonders of microscopic investio-a- 

 tion, to interest the community in our special branch of natural 

 science, and to convince the citizens of Philadelphia that we form 

 a living active department, of an Association well worthy of more 

 general encouragement, as well as of more bountiful pecuniar}^ 

 aid. 



These important objects have of course been chiefly advanced 

 bj'the successful management of our two semi-annual Exhibitions, 

 the latter, and more satisfactory of which, was contributed to by 

 eminent microscopists of New York and Boston, as well as of 

 Philadelphia, and was witnessed by nearly one thousand of our 

 citizens. " The microscopes" (to quote from the report of Dr. J. 

 H. McQuillen, Chairman of the Committee), "forty in number, were 

 arranged on tables in three rooms of the librar}^, and the principal, 

 if not the only drawback of the exhibition, was the contracted 

 space and the impossibility of properly accommodating the large 

 number of persons present." 



During the year original communications were presented by Dr. 

 James Tyson, "On a Setof Barth's Classified Specimens in Patho- 

 logical Anatomy," by Dr. J. Gibbons Hunt, on his novel and 

 16 



