PROCEEDINGS 



OF THE 



ACADEMY OF NATURAL SCIENCES 



OP 



PHILADELPHIA. 



1880. 



January 6, 1880. 

 The President, Dr. Ruschenbergeb, in the chair. 

 Forty-two persons present. 



The following papers were presented for publication: 



" On the Nndibranchiate Gasteropod Mnllusca of the North 

 Pacific Ocean, with special reference to those of Alaska," by Dr. 

 R. Bergh, of Copenhagen. Part II. 



" The Terrestrial Mollusca inhabiting tlie Cooks or Harvej^ 

 Islands," by Andrew Garrett. 



The deaths of Dr. S. S. White and Joshua T. Jeanes were 

 announced. 



January 13, 

 The President, Dr. Ruschenbkrger, in the chair. 

 Forty-two members present. 



On disarticulating branches in Ampelopsis. — Mr. Tuomas 

 Meehan remarked that some species of Ampelopsis threw off 

 their dead wood by disarticulation, as he pointed out some years 

 ago to be the case with Thuja and Taxodium among coniferous 

 trees. This was especially the case with Ampelopsis quinquefolia, 

 and A. hipinnata. Tiiese, in common witli many other climbing 

 plants, produced some portions of their annual growth of so low 

 2f 



