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REPORT ON THE PETROGRAPHICAL LABORATORY. 



By Assistant Professor J. E. Wolff. 



The course in Elementary Petrography was attended by eight 

 students, and the advanced course by an equal number. 



In connection with the latter course, field and laboratory 

 investigation was carried on by students in the following 

 areas : — 



Ascutney Mountain, Vermont (Monograph in preparation). 



Ayers Mountain, Connecticut. 



Blue Hills, Massachusetts. 



The Felsites and Associated Rocks in Saugus, Massachusetts. 



In the summer of 1894 a six weeks' course in General Petrogra- 

 phy was conducted at the Museum, and attended by four students, 

 either teachers or members of geological surveys. 



The Instructor has continued his field and laboratory work on 

 the Archaean Highlands of New Jersey and elsewhere. 



A considerable amount of petrographical material for exhibition 

 purposes has accumulated by gift and otherwise, and awaits the 

 opening of the Geological Exhibition Room. 



