. AJfERICA. 183 



Corrosion. The Problem of Waterfalls. The Problem of Inconsequent 

 Drainage. Summary. G. A. L. 



Gilmore, Gen. Q. A. [On the Channel of the Entrance to Cumberland 

 Sound.] Report of the Chief of Engineers to the Secretary of War 

 for the year 1876. 

 Discusses the formation and growth of bars. Fernandina bar is a 

 combination of a drift-bar and a wave- bar, and is not a delta-bar. 



Gorceix, H. Les exploitations de Tor dans la province de Minas 

 Geraes (Bresil). [Gold- workings in Minas Geraes, Brazil.] Bull, 

 Soc. Geogr. Paris, 6 ser. t. xii. pp. 530-543. 

 Most of the formerly-rich reefs are abandoned; and the few still 

 worked scarcely pay. None have, however, been worked with the 

 necessary knowledge or on a sufficient scale. The locahties more par- 

 ticularly described are Morro Yelho and Oura-Preto. G. A. L. 



Grinnell, G. B., and E. S. Dana. On a new Tertiary Lake Basin. 



Amer. Journ. ser. 3, vol xi. pp. 126-128. 

 Describe deposits near Camp Baker, Montana, indicating the exis- 

 tence of a Miocene lake-basin succeeded by a Pliocene one. At the 

 junction of the Pliocene and Miocene beds, where well marked, is about 

 six feet of hard sands and pebbles. The height is over 5000 feet. 



G. A. L. 



Hall, Charles E. Notes on Glacial Action visible along the Kitta- 

 tinny or Blue Mountain, Carbon, Northampton, and Monroe 

 Counties, Pennsylvania. Proc. Amer. Phil. Soc. vol. xiv. pp. 620, 

 621. 



. On Glacial Deposits at West Philadelphia. Ihid. pp. 633, 



634, map. 



Hall, Prof. James. Note upon the Geological position of the Ser- 

 pentine Limestone of Northern New York, and an inquiry regarding 

 the relations of this Limestone to the Eozoon Limestones of Canada. 

 Abstract in the Buffalo Courier, Aug. 25, reproduced in Amer, 

 Journ. ser. 3, vol. xii. pp. 298-300. 



Hartt, Ch. H. The Geological Survey of Brazil. First Preliminary 

 Report made to the Councellor Thomaz Jose Coelho de Almeida, 

 Minister and Secretary of State for Agriculture, etc. Translated 

 from the Portuguese manuscript (not yet published) by Prof. T. 

 B. Comstock. Amer. Journ. ser. 3, vol. xi. pp. 466-473. 



Gives details of the work done and proposed to be done. 



Hawes, G. W. The Greenstones of New Hampshire and their organic 

 remains. Amer. Journ. ser. 3, vol. xii. pp. 129-137, plate v. 



These greenstones (" chloritic and talcose schists " of Hitchcock, who 

 looks upon them as Huronian) cover a large area in the N. of the State. 

 They are metamorphosed sedimentary rocks, and are described, petro- 



