1884.] NATURAL SCIENCES OP PHILADELPHIA. 345 



The enumeration is not yet complete, but, as it covers about 

 three-fourths of the collection, a tolerably fair estimate may 

 be made of the remainder, on the basis of space occupied. 

 The conclusion is that the phanerogamic species will not exceed 

 24,000. To these we must add the ferns — 1018, by count - and the 

 remaining vascular crygtogams, estimated at 120 species, and 

 we have a total of phanerogams and vascular cryptogams of 

 a little more than 25,000 species. Of the extent of the collection 

 of lower cryptogams, embracing mosses, liverworts, lichens, 

 algae and fungi, the Conservator is at present unable to give any 

 estimate. 



Respectfully submitted, 



John H. Redfield, 



Conservator. 



REPORT OF THE MINERALOGICAL AND GEO- 

 LOGICAL SECTION. 



The meetings of the Section have been held regularly during 

 the year, but the attendance has not been as large as formerly. 

 There have been, however, satisfactory" additions to the collec- 

 tions of minerals and rocks, in part by purchases made with the 

 funds of the Section. 



Respectfully submitted, 



Theo. D. Rand, 



Director. 



REPORT OF THE PROFESSOR OF INYERTEBRATE 

 PALEONTOLOGY. 



The Professor of Invertebrate Paleontology respectfully 

 reports, that during the year he has delivered a course of lectures 

 on paleontology and physiography, which course, as in previous 

 years, was attended in principal part by teachers from the various 

 schools of the city. A special course of lectures on geology, 

 arranged by request of the Teachers' Institute of Philadelphia, was 

 delivered before the members of that body, with an attendance 

 ranging from one to two hundred. Six field excursions, em- 

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