54 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 162. 
400 Joseph (M. H.). The Republic mine [Washington]. 
Eng. and Mg. Jour., vol. lxvi, pp. 545-546, 2 figs., 1898. 
Includes notes on the occurrence of gold and silver. 
401 Julien (A. A.). The elements of strength and weakness in build- 
ing stones. 
Am. Geol., vol. xxi, pp. 397-398; Science, new ser., vol. vii, p. 683 
(4 p.), 1898. 
Contains summary of paper read before the New York Academy of 
Sciences. 
K. 
402 Keith (Arthur), Darton (N. H.) and. On dikes of felsophyre and 
basalt in Paleozoic rocks in central Appalachian Virginia. 
See Darton (N. H.) and Keith (A.), No. 198. 
403 Kemp (James Furman). The geology of the magnetites near 
Port Henry, New York, and especially those of Mineville. 
Am. Inst. Mg. Eugrs., Trans., vol. xxvii, pp. 146-203, pis. i-ix, figs. 
1-12, 1898. 
Describes the general geologic features of the region, the occurrence, 
character, chemical composition, relations, and origin of the nontitan- 
iferous ore bodies. Includes a bibliography of the subject. 
404 The geology of Mori ah and Westport townships, Essex 
County, New York, with a geologic map. 
N. Y. State Mus., 48th Ann. Rept., vol. i, Appendix, pp. 325-355, 3 
pis., 5 figs., and geologic map, 1897. 
See Bibliography and Index for 1895, No. 245. 
405 Preliminary report on the geology of Essex County [New 
York]. 
N. Y., 15th Ann. Rept. State Geologist, vol. i, pp. 22-23, 575-614, pis. 
i-xii, 2 figs., 1897. 
Describes the occurrence and distribution of the igneous, Cambrian, 
and Silurian rocks in the several townships, and includes notes on the 
iron ores. 
406 Geology of the Lake Placid region [New York]. 
N. Y. State Mus., Bull., vol. v, No. 21, pp. 51-67, 1 pi., and geologic 
map, 1898. 
Describes the character and age of the crystalline rocks and the gla- 
cial features of the region. 
407 [Geology and its relations to topography.] 
Am. Soc. Civil Engrs., Trans., vol. xxxix, pp. 79-82, 1898. 
In discussion of paper by John C. Brauner on the same subject, 
describes the topography of the vicinity of New York. 
408 The glacial or postglacial diversion of the Bronx River [New 
York] from its old channel. 
N. Y. Acad. Sci., Trans., vol. xvi, pp. 18-24, 1 fig., 1898. 
Discusses the recent geologic history of this river. 
