636 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Nine hundred and seventh Meeting. 



April 12, 1899. — Adjourned Stated Meeting. 



The Academy met at the Mineralogieal Laboratoiy, Univer- 

 sity Museum, Cambridge. 



The PRESIDENT in the chair. 



The Chair announced the death of Othniel Charles Marsh, of 

 New Haven, Associate Fellow in Class II., Section 3. 



A letter was read from the Massachusetts Historical Society, 

 tlianking the Academy for tlie use of its hall for the meetings 

 of the Society during the last two years. 



The following papers were read : — 



The Structure and Origin of Agates, illustrated by Specimens 

 from the Bigelow Collection, and by the Projection on the Screen, 

 by the Arc Light, of Sections in Polarized Light. By John E. 

 Wolff. 



A new Manganese Pyroxene from Franklin Furnace. By 

 John E. Wolff. 



Petrographical Notes on some Rocks from the Fiji Islands. 

 By A. S. Eakle. Presented by J. E. Wolff. 



