weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1891. 55 
275 Hinde (George Jennings). [Origin of the novaculitesof Arkansas.] 
Geol. Soc. London, Quart. Jour., vol. 1, pp. 391-392. 
In discussion of paper by F. Rutley on the "Origin of certain novacu- 
lites and quartzites." 
270 Hitchcock (0. H.). Glaciation of the White Mountains, New 
Hampshire. 
Geol. Soc. Am., Bull., vol. v, pp. 35-37. 
Discusses the evidences which indicate that glaciation has extended 
over the highest of the White Mountains. 
216a Ancient eruptive rocks in the White Mountains. 
Abstract: Am. Geol., vol. xiii, p. 213 (f p.). 
277 Hobbs (William H.). Yolcanite, an anorthoclase-augite rock 
chemically like the dacite. 
Abstracts: Geol. Soc. Am., Bull., vol. v, pp. 598-602; Am. Geol., vol. 
xiii, p. 214 (7 1.). 
Describes the petrographic character and chemical composition of a 
volcanic rock from the Lipari Islands. 
278 — ■ — On a recent diamond find in Wisconsin and of the probable 
origin of this and other Wisconsin diamonds. 
Am. Geol., vol. xiv, pp. 31-35, with map. 
Describes the location and occurrence of the diamonds that have 
been found in Wisconsin. 
270 Differential faults. 
Am. Geol., vol. xiv, pp. 35-37. 
Describes a strike fault occurring in the Green Mountains of Mas- 
sachusetts and Connecticut. 
279df Geological structure of the Hoosatonic Valley, lying east of 
Mount Washington, Massachusetts. 
Abstract: Am. Geol., vol. xiii, p. 112 (l p.). 
Noticed in Bibliography and Index for 1892 and 1893. 
279/> The geologic structure of the Mount Washington mass of the 
Taconic range. 
Abstract : Am. Nat., vol. xxviii, pp. 158-160. 
Noticed in Bibliography and Index for 1892 and 1893. 
280 Hollick (Arthur). Additions to the paleobotany of the Creta- 
ceous formation of Long Island [New York]. 
Torrey Bot. Club, Bull., vol. xxi, pp. 49-65, pis. 174-180. 
Abstract : Am. Jour. Sci., 3d ser., vol. xlvii, p. 402. 
Describes eight new species from this horizon. 
281 Fossil salvinias, including description of a new species. 
Torrey Bot. Club, Bull., vol. xxi, pp. 253-257, pi. 205. 
Refers to the literature of this genus and describes Salvinia elliptica 
Newb. from the Upper Cretaceous of Washington. 
282 A new fossil nelumbo from the Laramie group at Florence, 
Colo. 
Torrey Bot. Club, Bull., vol. xxi, pp. 307-310. 
Describes and figures a leaf of Nelumbo laramiensis n. sp. 
