weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1198. 31 
166 Cowles (Henry C). [Review of "Fossil Plants for Students of 
Botany and Geology, vol. i," by A. 0. Seward.] 
Jour, of Geol., vol. vi, pp. 436-438 ; Bot. Gaz., vol. xxvi, pp. 59-61, 1898. 
167 Crane (W. R.). Geography and detailed stratigraphy of the Kan- 
sas Coal Measures; description of mines, mining methods, 
and mining machinery; chemical and physical properties 
of Kansas coals j output and commerce; mining directory, 
and mining laws. 
Kan. Univ. Geol. Surv., vol. iii, pp. 108-336, pis. xxxi-lxx, figs. 4-54, 
1898. 
168 Crawford (J.). Recent severe seismic disturbances in Nicaragua. 
Am. Geol., vol. xxii, pp. 56-58, 1898. 
Describes earthquake shocks. 
169 Crosby ( W. O.). Geology : South shore [vicinity of Boston, Mass.]. 
Am. Soc. Adv. Sci., fiftieth anniversary meeting. Guide to localities 
illustrating the geology, marine zoology, and botany of the vicinity of 
Boston. Edited by A. W. Grabau and J. E. Woodman, pp. 21-31, 3 figs. 
Salem, Mass., 1898. 
Describes the geologic features of the region and gives a list of papers 
on its geology. 
170 History of the Blue Hills complex [Massachusetts]. 
Abstracts: Am. Assoc. Adv. Sci., Proc, vol. xlvii, pp. 304-305; Am. 
Geol., vol. xxii, pp. 263-264, 1898. 
Describes the igneous and sedimentary rocks of the region. 
171 [Review of various geologic papers.] 
Am. Geol., vol. xxii, pp. 377-383, 1898. 
172 Cross (Whitman). The geological versus the petrographical classi- 
fication of igneous rocks. 
Jour, of Geol., vol. vi, pp. 79-91; Abstracts, Science, new ser., vol. vii, 
p. 83 (£ p.) ; Am. Nat., vol. xxxii, pp. 465-466, 1898. 
Refers to the many broad classifications of rock masses necessary 
from a geologic standpoint, and concludes that most geologic criteria 
are not available for the construction of a systematic classification of 
rocks as objects — the petrographic scheme. 
173 Geology of the Cripple Creek gold mining district [Colorado]. 
Colo. Sci. Soc, Proc, vol. v, pp. 24-49, 1898. 
See Bibliography and Index for 1896, No. 150. 
174 The San Miguel formation. 
Colo. Sci. Soc, Proc, vol. v, pp. 235-241, 1898. 
See Biblography and Index for 1896, No. 152. 
175 See Day (W. 0.), No. 227. 
176 See Diller (J. S.), No. 234. 
177 Crump (H. M.). The clays and building stones of Kentucky. 
Eng. and Mg. Jour., vol. lxvi, pp. 190-191, 1898. 
Includes notes on their character and occurrence. 
