natural sciences of philadelphia. 249 



October 24. 

 The President, Dr. Ruschenberger, in the chair. 

 Eighteen members present. 



October 31. 

 The President, Dr. Ruschenberger, in the chair. 

 Twelve members present. 



On report of the committee, the following- pai)er was ordered 

 to be printed : — 



18t2.] 



