1884.] NATURAL SCIENCES OF PHILADELPHIA. 34Y 



The mineralogical collection of the Academy, as shown in the 

 accompanying Curator's report, has received a number of valuable 

 additions. The placing of the minerals of Pennsylvania in a 

 special case will, it is believed, not only be a convenience to 

 visitors, but, as it becomes more complete, will stimulate a search 

 for new mineral localities. The mineralogists of the State are 

 particularly asked to contribute to this local collection. 



As in previous annual reports, attention is again called to the 

 need, in this department, of scientific apparatus, both for the pur- 

 poses of teaching and for the prosecution of original research. A 

 lithological microscope, a reflecting goniometer, and a Groth's 

 universal apparatus for polarized light, are among the instru- 

 ments most urgently needed. 



Respectfully submitted, 



H. Carvill Lewis, 



Professor of Mineralogy . 



REPORT OF THE PROFESSOR OF INVERTEBRATE 

 ZOOLOGY. 



The Professor of Invertebrate Zoology respectfully reports that 

 during the past year, since March, when he was placed in office, 

 he has delivered his inaugural address on " The Study of Biology 

 in Germany " (March 10), and six lectures on " Elementary His- 

 tology," with demonstrations. 



He further reports that the collections under his charge have 

 greatly increased, especially by the addition of a superb collection 

 of marine sponges from the western coast of Florida, presented by 

 Mr. Joseph Willcox. The collection was described by Henry J. 

 Carter in the Proceedings. 



A course of some twenty lectures is intended to be given in 

 the early part of the coming year (January, February and March), 

 the subject being " Some of the Principles of Zoology." 



Very respectfully, 



Benjamin Sharp, 

 Professor of Invertebrate Zoology. 



