328 THE CANADIAN NATURALIST. [Sept. 



recent origin, many of the similar rocks now so abundant in 

 Maine and Massachussetts, and of which the White Mountains 

 are composed, may prove to be of similar age — a conclusion long 

 since suspected by some geologists. 



Prof. Hitchcock said he had examined the rocks on the 

 Maine border, and it appeared to him that the results agreed 

 generally with the conclusions arrived at by Prof. Bailey. Some 

 of the generalizations, however, as yet made, must be received 

 with some reservation until confirmed by more minute examina- 

 tion. He regarded the paper as a valuable contribution. 



ON THE GEOLOGY OF NORTH EASTERN AMERICA. 



Prof. T. Sterrt Hunt, the eminent Canadian geologist, 

 next made some remarks on the above subject, illustrating his 

 observations by means of a splendidly colored geological map of 

 Canada, New England, and of the northern and western portions 

 of the United States. 



He complimented the authors of the previous paper on the 

 fidelity with which they had discharged their task, and entered 

 into some detail in regard to the geological history and composi- 

 tion of many of the rocks of northeastern America. 



ON SURFACE CHANGES IN MAINE. 



By Dr. N. T. True. 



The paper began by stating that the almost infinit}' of time 

 since the earth was brought into existence was now generally 

 accepted, not only by geologists, but by non-scientific men. This 

 had led some writers to give loose reins to their imagination and 

 to attribute an immense period of time since the close of the last 

 great geological changes on the surftice of the earth without duly 

 examining the condition of things within their reach which, by 

 their accumulating evidence might lead to different results. The 

 paper then specified the various geological, surface, and other 

 changes that were now going on in New England, and from 

 observations within the range of human experience and record 

 attempted to show how materially a few thousand years might 

 alter the character of a country. From these data the paper in- 

 ferred that there was no necessity for throwing back the history of 

 the present geological era to a period much if any before the time 



