— 192 — 



Wadsworth M. E. — Some methods of determining the positive or negative 

 Character of minerai plates in converging polari zed light with the petro- 

 graphical microscope. S. 1. 8°. 



Ri. — Some statistics of Engineering Education. S. 1. 1897. 8°. 



Ri. — The elective system in Engineering Colleges. S. 1. 8°. 



hi. — The elective system as adopted in the Michigan Mining School. S. 1. 8°. 



Ri. — The Michigan College of Mines. S. 1. 1897. 8°. 



J(l. — The Origin and Mode of Occurrence of the Lake Superior Copper- 

 Deposits. S. 1. 1897. 8°. 



Id. — Zirkelite. A question of Priority. S. 1. 8°. 



P. B. 



