1879.] NATURAL SCIENCES OF PHILADELPHIA. 431 



December 16. 

 The President, Dr. Ruschenberger, in the chair. 

 Fifty-seven persons present. 



December 23. 

 The President, Dr. Ruschenberger, in the chair. 

 Seventy-two persons present. 



December 30. 

 The President, Dr. Ruschenberger, in the chair. 

 One hundred and ninety persons present. 



The following reports were read and referred to the Publication 

 Committee : 



