weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1894. 79 
461 Powell (Jolm W.). Report of the Director. 
U. S. Geol. Surv., 14tli Anu. Rept., pt. i, p. 321. 
Describes the plans for topography and geology for 1893-94, the 
progress of geologic work during 1892-93 in classifying and correlat- 
ing sedimentary and igneous rocks, and gives a summary of the work 
in terrestrial physics. Includes the administrative reports of topog- 
raphers and geologists in charge of the various divisions of the U. S. 
Geological Survey. 
46L* [Correlation of clastic rocks.] 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 159-160 (\ p.). 
Considers that both physical and hiotic evidence must he used in 
the correlation of rocks. 
463 Pratt (J. II.). Mineralogical notes on cerrusite, calamine, and 
zircon. 
Am. Jour. Sci., 3d ser., vol. xlviii, pp. 212-215. 
Describes the crystallographic characters of cerrusite from Mon- 
tana, calamine from Colorado, and zircon from Ontario. 
464 Prindle (L. M.). Note on an apatite crystal from Alexander 
County, N. C. 
Johns Hopkins Univ. Circ, vol. xiii, No. 112, p. 83. 
Describes the crystallographic characters of the crystal. 
465 Prosser (Charles S.). The Devonian system of eastern Pennsyl- 
vania and New York. 
U. S. Geol. Surv., Bull. No. 120, pp. ix + 81, pis. i-ii, fig. 1. 
Describes the lithologic character of the Devonian beds along several 
section lines in eastern Pennsylvania and New York and gives lists of 
fossils collected and the author's conclusions. 
466 Pumpelly (Raphael). Geology of the Green Mountains in Massa- 
chusetts. 
U. S. Geol. Surv., Monograph xxiii, pp. 34, pis. i-iii, figs. 1-8. 
Discusses the structure and correlation of the Archean, Algonkian, 
Cambrian, and Silurian strata of the region. 
467 [Correlation of clastic rocks.] 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 173-174. 
Remarks on the correlation of the deposits of the Lake Superior 
region. 
468 Purington (Chester Wells). Geological and topographical features 
of the region about Atlanta, Ga. 
Am. Geol., vol. xiv, pp. 105-108, with map of Georgia and sections. 
Describes peculiar topographic forms resulting from the long-con- 
tinued action of the atmosphere on the red clay and soils, which are 
the products of the disintegration of the gneiss of the region. 
469 Rand (Theodore D.). The Sadsbury steatite [Pennsylvania]. 
Phil. Acad. Nat. Sci., Proc, 1894, pp. 455-460. 
Describes the outcrops of steatite occurring in Chester County, Pa. 
