59 



like the hill on which the party were holding the meeting, 

 were made by the masses of ice, or glacier. Another set 

 of hills are produced by volcanic action ; still another 

 way of hill making is by the bending of rocks due to the 

 continued concentration and rending of the crust of the 

 earth. This, Prof. Morse said, might be illustrated by 

 chains of mountains, the largest mountains being found 

 on the borders of the largest areas of subsidence. He 

 illustrated these formations with a piece of fruit cake, 

 showing how the cake will bend and finally split, exposing 

 the corresponding strata on each side in the form of 

 mountain chains with a valley between. Prof. Morse 

 mentioned Prof. Niles' experiments on the expansion of 

 rocks, showing that lateral pressure in rocks exists. 



Mr. GEO. DIXON of England spoke of the Winston 

 dyke, and its formation, and gave a description of the 

 dyke crossing the German Ocean. Prof. MORSE re- 

 marked tm the fluid nature of trap, and the erosion 

 caused by ice, as in the Connecticut valley, where the 

 matrix of sandstone has been eroded, leaving the trap 

 standing and protecting the sandstone below. 



Mr. F. W. PUTNAM said he had looked for a shell 

 heap said to be on the point, but did not succeed in find- 

 ing it. He therefore gave a short account of the present 

 Indians of the plains and the existing Indian War, and 

 endorsed the views lately expressed by Mr. L. H. Mor- 

 gan in regard to the proper policy to be pursued in rela- 

 tion to the Indians. 



He then introduced Dr. G. A. OTIS, U. S. A., and Cu- 

 rator of the Army Medical Museum at Washington. 



Dr. OTIS gave a brief account of the life of the Indian 

 chief, Sitting Bull, from a pictograph made by that chief 

 and now in the Army Medical Museum. Dr. Otis also 



