618 PROCEEDINGS OF BOSTON MEETING. 



The following paper was read by title : 



CRUST AL ADJUSTMENT IN THE UPPER MISSISSIPPI VALLEY 

 BY CHARLES ROLLIN KEYES 



This paper is printed as pages 231-242 of this volume. 

 The next paper was — 



A GEOLOGICAL STUDY OF LAKE MOHONK AND LAKE MINNEWASKA, NEW YORK 



BY WILLIAM H. NILES 



Remarks were made by M. R. Campbell and N. S. Shaler. 



The following paper was presented by Professor Richards, of the Insti- 

 tute of Technology, who was introduced to the Society by Professor 

 Niles : 



A PRISMATIC STADIA TELESCOPE 

 BY ROBERT II. RICHARDS 



Remarks were made upon the paper by H. F. Reid. The paper is 

 published in The Journal of the Association of Engineering Societies, 

 volume xiii, January, 1894. 



The following two papers were read conjointly : 



ORIGIN OF THE COARSELY CRYSTALLINE VEIN GRANITES OR PEGMATITES 



BY WILLIAM O. CROSBY 



Remarks were made by Alfred C. Lane and the President. An abstract 

 is published in The American Geologist, volume xiii, March, 1894, page 

 215. 



A CLASSIFICATION OF ECONOMIC GEOLOGICAL DEPOSITS, BASED UPON ORIGIN 



AND ORIGINAL STRUCTURE 



BY WILLIAM O. CROSBY 



This paper is published in full in The American Geologist for April, 

 1894, pages 249-268. It will also appear in a future issue of the " Tech- 

 nology Quarterly." 



The following paper was read by title-: 



LAKE CA YUGA A ROCK BASIN 

 BY RALPH S. TARR 



This paper is printed as pa;ges 339-356 of this volume. 



