76 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 182. 
637 Pratt (J. H.), Hidden (W. E.) and. On rhodolite, a new variety 
of garnet. 
See Hidden (W. E.) and Pratt (J. H.), No. 348. 
637^ Twinned crystals of zircon from North Carolina. 
See Hidden (W. E.) and Pratt (J. H.), No. 349. 
638 On the associated minerals of rhodolite. 
See Hidden (W. E.) and Pratt (J. H.), No. 350. 
639 Preston (H. L.). On iron meteorites, as nodular structures in 
stony meteorites. 
Am. Jour. Sci., 4th ser., vol. v, pp. 62-64, 1898. 
Describes the characters of certain meteorites and the occurrence of 
siderite in stony matter. 
640 San Angelo meteorite. 
Am. Jour. Sci., 4th ser., vol. v, pp. 269-272, 4 figs., 1898. 
Describes the characters of the meteorite from . Texas and gives a 
chemical analysis. 
641 Price (J. A.). Notes on Indiana geology. 
Ind. Acad. Sci., Proc. 1897, pp. 262-266, with geologic map and sections, 
1898. 
Describes the character and relations of the Knobstone group along 
a portion of White River. 
642 Prosser (Charles S.). The classification and distribution of the 
Hamilton and Chemung series of central and eastern New 
York. Part I. 
N. Y. 15th Ann. Rept. State Geologist, vol. i, pp. 12-13, 87-222, pis. 
i-xiii, 16 figs., 1897; N. Y. State Mus., 49th Ann. Rept., vol. ii, pp. 87-222, 
pls.i-xiii, 16 figs., 1898. 
Describes the classification and stratigraphic and faunal characters 
of the series. Accompanied by geologic map. 
643 and Cumings (Edgar R.). Sections and thickness of the 
Lower Silurian formations on West Canada Creek and in 
the Mohawk Valley [New York J. 
N. Y. 15th Ann. Rept. State Geologist, vol. i, pp. 23-24, 615-659, pis. 
i-xii, 1897 ; N. Y. State Mus., 49th Ann. Rept., vol. ii, pp. 615-659, pis. i-xii, 
1898. 
Describes the stratigraphic relations and lithologic and faunal char- 
acters of the Lower Silurian formations of the region. 
644 Purington (Chester Wells). Preliminary report on the mining 
industries of the Telluride quadrangle, Colorado. 
U. S. Geol. Surv., 18th Ann. Rept., Pt. Ill, pp. 751-848, pis. ciii-cxviii, 
figs. 66-74, 1898. 
Gives a general description of the sedimentary and igneous rocks, 
the fissures and vein systems, and the occurrence of the silver and gold 
ores. Discusses the origin and age of the ore deposits. 
