weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1896. 73 
54:9a Pirsson (Louis Y.), Weed (W. H.) and. The Bearpaw Mountains, 
Montana. 
See Weed (W. H.) and Pirsson (L. V.), Nob. 721, 725. 
549/j Missourite, a new leucite rock from the Highwood Moun- 
tains of Montana. 
See, Weed (W. H.) and Pirsson (L. V.), No. 726. 
549o The geology of the Little Uocky Mountains [Montana]. 
See Weed (AY. II.) and Pirsson (L. V.), No. 727. 
550 Porter (J. A.). The Smuggler-Union mines, Telluride, Colo. 
Am. Inst. Mg. Eugrs., Trans., vol. xxvi, pp. 449-459, figs. 1-2, 1896. 
Describes the occurrence and character of the gold and silver ores in 
these mines. ' 
551 The Smuggler-Union mines, Telluride, Colo. 
Abstract: Mining and Scientific Press, vol. lxxiii, p. 461, 1896. 
Describes the geology of the region and the character and occurrence 
of the gold ores. 
5512 Powell (J. W.). James Dwight Dana. 
Science, new ser., vol. iii, pp. 181-185, 1896. 
Gives a sketch of Professor Dana's work as a scientific investigator. 
553 Pratt (J. H.). On northupite, pirssonite, a new mineral, gaylus 
site and hanksite from Borax Lake, San Bernardino County, 
Oal. 
Am. Jour. Sci., 4th ser., vol. ii, pp. 123-135, 1896. 
Describes the occurrence and chemical and crystallographic charac- 
ters of the minerals named. 
554 Penfield (S. L.) and. On the occurrence of thaumasite at 
West Paterson, 1ST. J. 
See Penfield (S. L.) and Pratt (J. II.), No. 540. 
555 Prest (W. H.). Glacial succession in central Lunenburg, K. S. 
N.S.Inst. Sci., Proc. and Trans., 2d ser., vol. ii, pp. 158-170, 1890. 
Describes the glacial deposits of the region, and gives the author's 
views of the succession of glacial phenomena. 
550 Price (John M., jr.). Bock exposures about Atchison [Kansas]. 
Kans. Acad. Sci., Trans., vol. xiv, pp. 218-219, 1896. 
Describes the rock exposures in the vicinity of Atchison, and gives.a 
vertical section showing the thickness and character of the strain. 
557 Prosser (Charles S.). [Review of "A preliminary report on the 
geology of South Dakota," by J. E. Todd.] 
Science, new ser., vol. iii, pp. 368-369, 1896. 
558 [Review of "Report on field work in Chenango < lounty, Few 
York," by J. M. Clarke.] 
Science, new ser., vol. iii, pp. 525-526, 1896. 
559 [Eeview of "The University Geological Survey of Kansas, 
Yol. I."] 
Science, new ser., vol. iv, pp. 81-83, 1896. 
