Report of the Librarian. 
liii 
- On the Hornblende of St. Lawrence County, N. Y., and 
its G-liding Planes. 
-- On a new Plan Proposed for future Work upon the Geo¬ 
logical Map of the Baltimore Kegion. 
- Syllabus of Lectures on Optical Crystallography. 
--Some Modern Aspects of Geology. 
-- Geological and Petrographical Observations in Southern 
and Western Norway. 
- Note on the Eruptive Origin of the Syracuse Serpentine. 
—-— The Gabbros and Diorites of the “Cortlandt Series.” 
-On the Paramorphosis of Pyroxene to Hornblende in 
Rocks. 
--A Summary of Progress in Mineralogy and Petrography 
in 1885. 
--On a Remarkable Crystal of Pyrite from Baltimore County, 
Md. 
--Note on some Remarkable, Crystals ,of Pyroxene from 
Orange County, N. Y. 
- Geology of Baltimore and its Vicinity. 
--Notes on some Eruptive Rocks from Alaska. 
- (and Burton, W. M.) On the Crystal Form of Metallic 
Zinc. 
---(and , Gill, A. C.) Contributions to the Mineralogy of 
Maryland. 
Winslow, Arthur. The Geology and Mineral Products of 
Missouri. 
- Notes on the Cambrian in Missouri and the Classification 
of the Ozark Series. 
-The Missouri Coal Measures and the Conditions of their 
Deposition. 
-- The Mapping of Missouri. 
•- Coal Deposits of Missouri from field Work Prosecuted dur¬ 
ing the Years 1890 and 1891. 
Wulfing, E. A. Untersuchung eines Nephelinsyenits aus dem 
mittleren Transvaal, Sud-Afrika. (Presented by Dr. E. 
Cohen.) 
Yates, Dr. Lorenzo C. Charm Stones—The so-called Plummets 
or Sinkers of California. 
