46 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull.U6. 
220 Hobbs (William Herbert). A contribution to the mineralogy of 
Wisconsin. 
Univ. of Wis., Science ser., vol. i, pp. 109-156, pis. 4-8. 
Gives a list of papers on the subject and describes the mineralogic 
characters of quartz, arsenopyrite, calcite, smithsonite, galena, cerus- 
site, sphalerite, gypsum, barite, marcasite, pyrite, azurite, malachite, 
and diamonds. 
221 Mineralogical notes. With analyses by Herman Sehlundt and 
Louis Kahlenberg. 
Am. Jour. Sci., 3d ser., vol. 1, pp. 121-128. 
Describes and gives the chemical composition of cerussite from Mon- 
tana, barite, mauganite, and chloritoid from Michigan, and hessonite in 
a pegmatite from Connecticut. 
222 Hoffman (G. Christian). Chemical contributions to the geology 
of Canada from the laboratory of the Survey. 
Canada Geol. Surv., Ann. Rept., 1892-93, new ser., vol. vi, Kept. K, 93 pp. 
Gives chemical analyses of rocks and minerals from Canada. 
22.) A plumbiferous tetrahedrite. 
Am. Jour. Sci., 3d ser., vol. 1, pp. 273-274 (£ p.) (communicated). 
Describes the mineralogic and chemical characters of a plumbiferous 
tetrahedrite from British Columbia. 
224 Hollick (Arthur). Dislocations in certain portions of the Atlantic 
Coastal Plain strata and their probable cause. 
N. Y. Acad. Sci., Trans., vol. xiv, pp. 8-20, tigs. 1-5. 
Abstract : Geol. Soc. Am., Bull., vol. vi, pp. 5-7. 
Discusses the theories concerning the cause of the principal lines of 
disturbance in the Atlantic Coastal Plain and describes the tilted and 
folded deposits underlying portions of the terminal moraine in this 
region. Discusses the theories of mountain-making forces or ice action 
as the cause of the folding and faulting. 
225 Descriptions of new leaves from the Cretaceous (Dakota 
group) of Kansas. 
Torrey Bot. Club, Bull., vol. xxii, pp. 225-228, pis. 236-237. 
Gives descriptions and figures of three new species of fossil plants. 
226 A new fossil Liriodendron from the Laramie at Walsenberg, 
Colo., and its significance. 
Abstract : Am. Assoc. Adv. Sci., Proc, vol. xliii, p. 225 (i p.). 
227 Holm (Theo.). On the validity of some fossil species of Lirioden- 
dron. 
Bot. Gazette, vol. xx, pp. 312-316, pi. xxiii. 
Eeviews the description of certain fossil plants by Arthur Hollick. 
228 Hovey (E. O.). Notes on some specimens of minerals from Wash- 
ton Heights, New York City. 
Am. Mus. Nat. Hist., Bull., vol. vii, pp. 341-342. 
Describes tho characters of xenotime, monazite, and tourmaline, and 
mentions the associated minerals. 
