THE GEOLOGY OF MOUNT GREYLOCK. 145 



sion of Julius Caesar ? as we read in his commentaries that 

 the Helvetians then burned their possessions and abandoned 

 their dwellings. 



Mr. Chamberlain replied that lake dwellings were found all 

 over central Europe. No one would imagine that the Hel- 

 vetii had burned all the lake dwellings in Europe. 



Mr. VanderSmissen said that much that related to pre- 

 historic antiquity was purely conjectural. Great care should 

 be exercised in forming opinions on those matters. The same 

 results in different parts of the globe did not prove a similarity 

 of race, or original relationship, but a similarity arising from 

 general principles of human nature. 



Mr. H. R. Wood, B.A., read a paper by Prof T. Nelson 

 Dale, on "■ The Geology of Mount Greylock," of which the 

 following is an abstract : — 



The paper gave a brief review of -sevei'al months geological field 

 work in Berkshire County, Mass, in the service of the U. S. 

 Geological Survey (Archean DiA'ision, in charge of Prof. Raphael 

 Punipelly, of Newport, R.I.). After a few lenuirks on the general 

 aim of tlie U. S. Geological Survey, the topogi'aphical basis of its 

 work in Massachusetts, and an explanation of the method pursued in 

 the summer's work oil GreyJock, the general lithological and^sti-uc- 

 tural character of the mountain was outlined, and some of the 

 difficulties which beset the geologist in a highly metamorphic region 

 were dwelt upon in detail. The paper closed with a brief allusion to 

 the various industries, occupations Hud characteristics of the inhabi- 

 tants of the resrion described. 



SIXTEENTH MEETING. 



Sixteenth Meeting, 5th March, 1887, the President in the 

 Chair. 



Exchanges since last meeting, 29. 



Mr. John Phillips read a paper on " The Centrifugal Forces 

 of the Planets." 



Mr. J. A. Livingston read a paper entitled " Notes on 

 Astronomy." 

 10 



