KEPORT OF THE SECRETARY. 73 



Maine, particularly its remarkable osars, and Prof. G. F. Wright studied 

 the glacial border in l'e:ms.ylvania and the terraces of the Upper Alle- 

 ghany Kiver. Prof. W. ]\1. Davis, of Harvard University', working under 

 Prof. Chaniberlin's direction, made a careful study of the striation of 

 Mount Monadnock, one result of which was a very satisfactory demon- 

 stration of the incurving of the currents in the lee of that mountain. 

 He also made an examination of two recent gorges near Canajoharie, N. 

 Y., with reference to the time and method of their production; but his 

 chief attention was directed to the study of the remarkable parallel and 

 doli)h in-backed drift ridges of Wayne and Cayuga Counties in the same 

 State. Mr. Buell continued his study of the bowlder trains of the south 

 central Wisconsin. Prof. Chamberlin was assisted both by Mr. Gilbert 

 and Prof. Shiiler in a number of his glacial studies, and the latter car- 

 ried out an extended scheme of study of the glacial drift on the islands 

 of Nantucket, Martha's Vineyard, and Mount Desert. 



Montana Division of Geology. — Dr. P. V. Hayden, with his assistant, 

 Dr. A. C. Peale, continued his study of the geology of Montana, his in- 

 quiries chierly relating to the Gallatin Valley, particular attention being 

 jiaid to the southern end of the Bridger Range and the extension of its 

 beds on the soutliern side of the Gallatin Valley. In addition to this 

 work Dr. Peale prepared a statistical paper on the Mineral Waters of 

 the United States, which was published as P>ulletin No. 32 of the Survey 

 series. 



Yellowstone Parle Divifilon of Geology. — Notwithstanding the limited 

 character of the held season in the Yellowstone Park, Mr. Arnold Hague 

 was able to reach tolerably definite conclusions respecting the more re- 

 markable of its geological features. The work in the field was supple- 

 mented by detailed studies in the laboratory, Dr. F. A. Gooch confining 

 himself almost exclusively to chemical questions connected with the 

 thermal waters of the geyser basins and ]\Iammoth Hot Springs, and Dr. 

 Hallock continuing his investigations on the physics of geyser action. 

 Mr. J. P. Iddings, in investigating the acidic lavas of the park, prepared 

 for the Seventh Annual Eeport of the Director a paper entitled " Ob- 

 sidian Cliff of Yellowstone Park," which not only gives a description of 

 Obsidian Cliff, but presents a resume of all that is known as to the erup- 

 tions of obsidian in other parts of the world. Mr. Hague dwells upon 

 the need of Congressional action to settle the definite boundaries of the 

 Park, and reiterates his previous suggestiousas to the limits which should 

 be adopted. He also adverts to the great importance of the Yellow- 

 stone Park as a forest reservation, stating that he is acquainted with no 

 tract in the Kocky Mountains where the necessity for the conservation 

 of the forests appears so urgent or the direct advantage to be gained so 

 immediate. 



Colorado Division of Geology. — The field work in this division since 

 the date of the last report has been mainly carried on by Mr. Emmons' 



