Contents. v 
DECEMBER NUMBER. 
Notes on the Geology and Petrography of Monhegan Is- 
land, Maine. E. C. E. Lord [Plate XXIII] 329 
Mineralogical and Petrogruphic Study of the Gabbroid 
Rocks of Minnesota and more Particularly of the 
Plagioclasytes. A. N. Winchell 348 
Meteorology of the Ordovician. F. W. Sardeson. [Il- 
lustrated] 381 
Editorial Comment, 391. 
Review of Recent Geological Literature. — ScapoUte Rocks from Alas 
ka, J. E. Spurr, 393. Graftonite, a New Mineral from Grafton, 
N. H., and its Intergrowth with Triphylite, S. L. Penfifld, 
393. — Two New Occurrences of Coruudum in North Carolina, 
J. H. Pratt, 393. 
Monthly Author''s Catalogue of American Geological Literature, 394. 
Personal and Scientific News, 397. 
Index, 399. 
Erratum. 
On p. 132, line 26, for Devonian read Ordovician. 
