78 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 162. 
655 Richardson (0. H.). The Washington limestone in Vermont. 
Abstracts, Am. Assoc. Adv. Sci., Proc, vol. xlvii, pp. 295-296 ; Science, 
new ser., vol. viii, pp. 469-470 (ip.); Am. Geol., vol. xxii, pp. 257-258 
(i p.), 1898. 
Describes the occurrence, relations, and chemical character of the 
limestone strata. 
656 Rickard (T. A.). Vein structure in the Enterprise mine [Colorado]. 
Colo. Sci. Soc, Proc, vol. v, pp. 123-130, 6 pis., 1898. 
Describes the vein phenomena in this mine. 
657 The minerals which accompany gold and their bearing upon 
the richness of the ore deposits. 
Mg. and Sci. Press, vol. lxxvii, pp. 81-82 and 105-106, 1898. 
658 Ries (Heinrich). Geology of Orange County [New York]. 
N. Y., 15th Ann. Rept. State Geologist, vol. i, pp. 18-19, 393-476, pis. 
i-xl, 26 figs., 1897; N. Y. State Mus., 49th Ann. Rept., vol. ii, pp. 393-476, 
pis. i-xl, 26 figs., 1898. 
Describes the physiography, the character, and occurrence of the 
pre-Cambrian, Cambrian, Silurian, Devonian, and Pleistocene rocks, and 
of the dike rocks, and the occurrence of road material, clays, building 
stones, and iron ores. 
659 Physical tests of the Devonian shales of New York State to 
determine their value for the manufacture of clay products. 
N. Y., 15th Ann. Rept. State Geologist, vol. i, pp. 673-698,1897; N. Y. 
State Mus., 49th Ann. Rept., vol. ii, pp. 673-698, 1898. 
Describes the general properties of shales and the character and 
occurrence of the shale-bearing divisions of the Silurian and Devonian 
systems of New York. 
660 The clay- working industry of the United States in 1897. 
U. S. Geol. Surv., 19th Ann. Rept., Pt. VI (continued), pp. 469-486, 1898. 
Includes statistics of production, analyses of clays, and general notes 
on the geologic occurrence of clays. 
661 Clay deposits and clay industry in North Carolina. A pre- 
liminary report. 
N. C. Geol. Surv., Bull. No. 13, 157 pp., pis. i-vii, figs. 1-5, 1897; 
Reviews, Jour, of Geol., vol. vi, pp. 545-547; Am. Geol., vol. xxii, p. 382 
(ip.), 1898. 
Describes the origin, chemical and physical characters of clay, and 
the occurrence and character of the clays of North Carolina. Includes 
a bibliography. 
662 The fuller's earth of South Dakota. 
Am. Inst. Mg. Engrs., Trans., vol. xxvii, pp. 333-335, 1898. 
Describes its occurrence in the Black Hills. 
663 The clays and clay industry of Colorado. 
Am. Inst. Mg. Engrs., Trans., vol. xxvii, pp. 336-340, 1898. 
Describes its occurrence, character, and chemical composition. 
664 Allanite crystals from Mineville, Essex County, New York. 
N. Y. Acad. Sci., Trans., vol. xvi, pp. 327-329, 2 figs., 1898. 
Describes their occurrence and crystallographic characters. 
