1807.] 285 IWickersham. 



tion, promising to conform to tlie Constitution and By-Laws of the 

 Society ; and until these conditions are fulfilled, he shall possess none 

 of the rights of membership, nor shall his name be borne upon the 

 roll of members. 



As some persons were nominated for membership before 

 the change in tlie By-Laws had taken effect, an election 

 was held under suspension of the rules, and the following 

 persons were chosen Resident Members : — 



Messrs. Jeremiah L. Newton and Joshua P. Preston, of 

 Boston, and Mr. Samuel Lockwood, of Roxburv. 



July 3, 1867. 

 The President in the chair. Sixteen members present. 



Dr. Green made a communication on Binocular Vision. 



Mr. W. Wickersham offered some remarks upon the trav- 

 elling of rocks : after speaking of the transj^ortation of rocks 

 by glaciers, icebergs, floods, etc., he said he had observed 

 that rocks travelled on the dry land without any such assist- 

 ance as they receive from glaciers, etc., but by the action 

 of frost, freezing and thawing ; a rock becoming separated 

 from a ledge, often falls some distance and then rolls. If it 

 lies on a slope, however gentle, afterwards, the formation of 

 ice under it moves it slightly forward, and on the return of 

 warm weather the rock settles down a little in advance of its 

 former position, and so on. He referred to a locality near 

 Yokentown in York Co., Penn., at a spur of tlie Blue Ridge, 

 where the rocks had moved in this manner from ledges on 

 either side of a valley to its centre, and accumulated there in 

 large numbers. 



The President exhibited an Esquimaux "fire-stick." It 

 seemed to him that the chief interest in speculating upon 

 this was, that in so many different parts of the world, essen- 

 tially the same process was in use for obtaining lire, in South 

 Africa, the Pacific Islands, St. Domingo and the Arctics. 



