Report of the Librarian. 
XXXIX 
Geinitz, H. B. and Marck, W. v. d. Geologie von Sumatra. 
Gilbert, G. K. The Moon’s Pace. 
--Strength of the Earth’s Crust. 
-History of the Niagara River. 
-Colorado Plateau Region considered as a field for Geological 
Study. 
-The Sufficiency of Terrestrial Rotation for the Deflection of 
Streams. 
-A new Method of Measuring Hei ghts by Means of the 
Barometer. 
Godshall, L. D. A Review of the Russell Process. 
Grant, U. S. Note on Quartz-Bearing Gabbro in Maryland. 
-An account of a Deserted Gorge of the Mississippi near 
Minnehaha Palls. 
-Report of Geological Observations Made in Northeastern 
Minnesota during the Summer of 1888. 
-The Stratigraphic Position of the Ogishke Conglomerate 
in Northern Minnesota. 
-Notes on the Molluscan Fauna of Minnesota. 
- Conchologica’l Notes. 
Greene, E. L. West American Oaks. 
Hale, Irving. The Latest Method of Electric Car Control. 
—..— The Present Limitations of Electric Power in Mining. 
Harker, A. Rocks from the Cross Fell Inlier. 
-Rocks from the Tonga Islands. 
-— Local Thickening of Dykes and Beds by Folding. 
-Slaty Cleavage and Allied Rock-Structures. 
-Successive Stages of Slaty Cleavage. 
--Cause of Slaty Cleavage. 
--Compression v. Shearing. 
--Physics of Metamorphism. 
- The Eruptive Rocks in the Neighborhood of Sarn, Caer¬ 
narvonshire. 
-The Oolites of the Cave District. 
-Notes on North of England Rocks. Parts I, II, and III. 
--- The Ancient Lavas of the English Lake District. 
- Petrological Notes on some of the Larger Boulders on the 
Beach south of Flamborough Head. 
