TITLES OF PAPERS. 608 



The next paper was read, in the absence of the author, by J. P. Iddings : 



PRE-PALEOZOIC DECAY OF CRYSTALLINE; ROCKS NORTH OF LAKE HURON 



BY ROBERT BELL 



This paper is printed as pages 357-366 of this volume. 

 The following communication was presented: 



GABBROS ON THE WESTERN SHORE OF LAKE CHAMPLAIN 



BY J. F. KEMP 



This subject was discussed by G. H. Williams, F. D. Adams, and the 

 author replied. The paper is printed as pages 213-224 of this volume. 



The next paper was read by title : 



MICA DEPOSITS IN THE LAURENTIAN OF THE OTTAWA DISTRICT 



BY ROBERT W. ELLS 



The paper is printed as pages 481-488 of this volume. 

 The next paper was — 



■INTRUSIVE SANDSTONE DIKES IN GRANITE 

 BY WHITMAN CROSS 



Remarks upon this paper were made by N. S. Shaler. The paper is 

 printed as pages 225-230 of this volume. 



The following paper was read by title: 



v. 



AGE OF THE AURIFEROUS SLATES OF THE SIERRA NEVADA 

 BY JAMES PERRIN SMITH 



The paper is printed as pages 243-258 of this volume. 



The following paper was read, in the absence of the author, by W. M. 

 Davis. 



CERTAIN CLIMATIC FEATURES OF MARYLAND 

 BY WILLIAM B. CLARK 



The substance of this paper is published in the First Biennial Report 

 of the Maryland State Weather Service for the years 1892 and 1893. 



