Wyman.] 186 



entrusted all the funded property of the Society, with power to sell 

 and re-invest according to their judgment." 



Sec. Yl., Art. 2, to be struck out, and the following substituted 

 in its place : " The Council shall, previously to every annual meeting, 

 appoint a committee whose duty it shall be to audit the accounts of 

 receipts and expenditures of the Corporation." 



September 20, 1865. 

 The President in the chair. 



Thirty members present. 



Prof. Wyman, in noticing a fine exhibition of ripple marks 

 on strata of the Potsdam sandstone in Keeseville, N. Y., 

 made some observations on similar marks which he had seen 

 made. 



Those of the Potsdam sandstone were distinct and fi^-esh 

 as those recently made. He had noticed on the border of 

 the lake in the neighborhood, the recent ones made on a 

 sandy beach, when the wind ruffled the sm-face of the wa- 

 ter. They were three inches wide, while the waves above 

 them measured three feet from crest to crest. During a 

 calm they flattened down and gradually disappeared. They 

 were parallel to the shore, and forced on by the waves ad- 

 vanced toward it, travelling the distance of three inches in 

 half an hour. Indications of such changes in position could 

 also be plainly seen on the Potsdam sandstone. There 

 were sometimes transverse marks, occurring at breaks in the 

 course of those Ipng parallel to the shore, occasioned by 

 cross waves. Such were also indicated in the Potsdam 

 sandstone. 



In fonu, the ripple marks seen in the lake were steep on 

 the shore side, but presented a longer slope towards the 

 water side ; thus one could distinguish the shore from the 



