PROCEEDINGS OF THE CENTENARY MEETING. xxv 



Henry Fairfield Osborn, LL.D., Sc.D., Research Professor of Zoology in 

 Columbia College, Curator Emeritus of the Department of Vertebrate Paleon- 

 tology in the American Museum of Natural History : 



Tetraplasy, or Law of the Four Inseparable Factors of Evolution.* 

 George Howard Parker, Sc.D., Professor of Zoology in Harvard University : 

 Sensor}' Appropriation as illustrated by the Organs of 1 ste in Verte- 

 brates.* 

 John Muirhead Macfarlane, Sc.D., Professor of Botany in the Uni- 

 versity of Pennsylvania: 



The Relation of Protoplasm to its Environment.* 

 William Healy Dall, A.M., Sc.D., Honorary Curator of Mollusca in the 



United States National Museum : 



Mollusk Fauna of Northwest America. 

 After luncheon Henry Grier Bryant, LL.B., President of the Geographical 

 Society of Philadelphia, read a paper on Governmental Agencies in the Advance- 

 ment of Geographical Knowledge in the United States, illustrated by maps and 

 charts 



* 



The scientific sessions closed with a well-illustrated lecture by Witmer 

 Stone, A.M., the Curator of Ornithology in The Academy of Natural Sciences 

 of Philadelphia, on the Fauna and Flora of the New Jersey Pine Barrens.* 



Announcing the adjournment the President remarked: 



On behalf of the Members of The Academy of Natural Sciences of Philadelphia 

 I assure you that we all appreciate the disadvantages under which specialists 

 labor who leave their homes to attend a general scientific meeting where they 

 will probably hear only a few papers on the particular subject in which they are 

 interested. We therefore regard it as a high compliment to the Academy that 

 after having contributed your communications to the program, we have received 

 from you the moral support and encouragement of your presence during the 

 whole period of the sessions. This is greatly appreciated by the members of 



our institution. 



And now adjourning for the last time in the present century we will visit the 

 Museum, and the microscopic exhibit in the Reading Room. Some of our 

 members will join with the delegates from sister institutions tonight in welcoming 

 the second century of the Academy's existence. 



The rest of the afternoon was devoted to the examination of one hundred and 

 thirty-two microscopes displayed in the Reading Room, and a selection from the 

 Academy's superb collection of butterflies arranged on the gallery surrounding 



the New Hall. 



