weeks. I PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1896. 51 
343 Hopkins (T.O.). The Carboniferous sandstones of western Indiana. 
Ind. Dept. Geol. and Nat. Res., 20th Ann. Rept., pp. 188-327, pis. viii- 
xvi; Stone, vol. xiii, pp. 227-238, 334-312, and 456-466, 6 pis., 1896. 
Describes the varieties and distribution of sandstones, and the geo- 
logic history of the Indiana sandstones, including local details of the 
different quarries. Gives tables of statistics, analyses, two colored geo- 
logic maps of portions of western Indiana and a bibliography. 
344 The sandstones of western Indiana. 
Mineral Industry, 1895, pp. 559-564, 1896. 
Describes sandstones of the Carboniferous formation and gives a 
chemical analysis. 
345 Hoskins ( Leander Miller). Flow and fracture of rocks as related 
to structure. 
U. S. Geol. Surv., 16th Ann. Rept., Pt. I, pp. 845-872, figs. 163-169, 1896. 
Discusses the conditions of flow and structure, strain and stress, and 
their application to rock structure. 
346 Hovey (Horace C). The making of Mammoth Cave [Kentucky]. 
Sci. Amer., vol. lxxv, p. 151, 1896. 
Discusses the formation of the Mammoth Cave in Kentucky. 
347 The colossal cavern of Kentucky. 
Sci. Amer., vol. lxxv, p. 183, 1896. 
Describes a recently discovered cave in Kentucky. 
348 Geological notes on the Isles of Shoals [New Hampshire]. 
Abstract: Am. Assoc. Adv. Sci., Proc, vol. xliv, pp. 136-137, 1896. 
Gives a brief description of the island and of the occurrence of granite. 
349 Hubbard (Lucius L.). The origin of salt, gypsum, and petroleum. 
Mich. Geol. Surv., vol. v, Pt. I, pp. ix-xxiv, 1895. 
Gives a brief description of the origin of these products. 
350 Hyatt (Alpheus). Report on the Mesozoic fossils [Alaska). 
U. S. Geol. Surv., 17th Ann. Rept , Pt. I, pp. 907-908, 1896. 
Describes the relations of Mesozoic faunas of different localities. 
351 Terminology proposed for description of the shell in Pele- 
cypoda. 
Abstract: Am. Assoc. Adv. Sci., Proc, vol. xliv, pp. 115-148, 1896. 
Describes briefly tbe characteristics of some shells and gives the author's 
proposed terminology. 
I. 
3513 Iddings (Joseph P.). Igneous rocks [Yellowstone National Park]. 
U. S. Geol. Surv., Geol. Atlas of U. S., folio No. 30, 1896. 
Describes the characters and distribution of the extrusive and intru- 
sive rocks. 
353 Extrusive and intrusive igneous rocks as products of inag- 
matic differentiation. 
London Geol. Soc, Quart. Jour., vol. lii, pp. 606-617, 1896. 
Describes the relations of the eruptive rocks of Electric Peak and 
Sepulcher Mountain to tbe whole series of eruptions occupying Tertiary 
time, and which spread out over large areas in Montana, Wyoming, and 
Idaho. Presents a map showing the extent of the volcanic area. 
