44 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. Ud. 
274 Halse (Edward). The quicksilver mine and reduction works at 
Huitzuco, Guerrero, Mexico. 
North of Eng. Inst, of Mg. and Meoh. Engrs., Trans., vol. xlv, pt. 1, pp. 
72-88, 1895. 
Describes the geologic features of the region, the character and occur- 
rence of the ore and discusses its origin. 
214a Harper (G. W.) and Bassler (R. S.). Catalogue of the fossils of 
the Trenton and Cincinnati periods occurring in the vicinity 
of Cincinnati, Ohio. 
Cincinnati, Ohio, 34 pp., 1896. 
275 Harrington (B. J.). The chemical composition of andradite from 
two localities in Ontario. 
Can. Rec. Sci., vol. vi, pp. 479-481, 1896. 
Gives chemical analyses of the material. 
276 Adams (Frank D.) and. On a new alkali hornblende and a 
titaniferous andradite from the nepheline-syeniteof Dungan- 
non, Hastings County, Ontario. 
See Adams (F. D.) and Harrington (B. J.), No. 5. 
277 Harris (Gilbert D.). Claiborne fossils. 
Am. Pal., Bull., vol. i, No. 1, pp. 1-50, pi. i, 1895. 
Gives a list of Claiborne fossils and a description of three new species. 
278 Neocene Mollusca, of Texas, or fossils from the deep well at 
Galveston. 
Am. Pal., Bull., vol. i, No. 3, 25 pp. 4 pis., 1895. 
279 The Midway stage. 
Am. Pal., Bull., vol. i, No. 4, 125 pp., 15 pis., 1896. 
Gives a historical sketch of the study of the Midway stage and describes 
sections in Texas, Arkansas, Tennessee, Mississippi, Alabama, and Geor- 
gia. Includes descriptions of molluscan remains of Midway stage. 
280 New and interesting Eocene Mollusca from the Gulf States. 
Phil. Acad. Nat, Sci., Proc, 1896, pp. 470-482, pis. xviii-xxiii, 1896. 
The fossils described are from the Eocene of Alabama and Mississippi. 
281 See Say (Thomas), No. 599. 
282 Hartzell (J. C, jr.). The history and principles of geology and 
its aim. 
Am. Nat., vol. xxx, pp. 177-183, 271-279, 1896. 
Gives a historical sketch of the science of geology and discusses its 
principles and aims. 
283 Hatcher (J. B.). Recent and fossil tapirs. 
Am. Jour. Sci., 4th ser., vol. i, pp. 161-180, pis. ii-v, 18 r:, 6. 
Describes Protapirus validens n. sp., and discusses the osteology of 
the genus. Reviews the literature regarding the genera Colodon and 
Protapirus. 
