eks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1894. 29 
33 Chamberlin (Thomas C.) and Leverett (Frank). Further studies 
of the drainage features of the Upper Ohio Basin. 
Am. Jour. Sci. ; 3d ser., vol. xlvii, pp. 247-283 and p. 483, four maps 
and five figures. 
Abstract: Am. Geol., vol. xiii, pp. 217-219. 
Describes the drainage features and erosion of the Upper Ohio tribu- 
taries, the old fluvial floors, drift, and terraces. Gives a summary 
statement of four hypotheses and describes and illustrates by diagrams 
the ratios of work done. 
54 Charleton (A. G.). Nickel, its history, uses, and distribution. 
Sci. Am. Suppl., vol. xxxvii, pp. 15418-15419. 
Discusses the genesis of nickel. 
)5 Chester (Albert H.). Acanthite from Colorado. 
School of Mines Quart., vol. xv, pp. 103-104. 
Describes crystals of silver sulphide which are considered to belong 
to this species. 
;6 On caswellite, an altered biotite from Franklin Furnace, N. J. 
Quartz crystals from Ellenville, N. J. 
N. Y. Acad. Sci., Trans., vol. xiii, pp. 181-184. 
Describes the chemical and optical characters of a new mineral 
species, caswellite, and the crystallographic characters of quartz 
crystals. 
)7 Church (John A.). [Geological distribution of the useful metals 
in the United States.] 
Am. Inst. Mg. Engrs., Trans., vol. xxii, pp. 732-735. 
Iu discussion of paper by S. F. Emmous on the same subject. 
bej;8 [The genesis of ore deposits.] 
Am. Inst. Mg. Engrs., Trans., vol. xxiii, pp. 593-597. 
In discussion of paper on the same subject by E. Posepny. 
19 Clark (William B.). Cretaceous and Tertiary geology. 
N. J. Geol. Surv., Kept, for 1893, pp. 329-355. 
Contains a geueral discussion, classification, and description of the 
formations and describes certain typical section lines across the Cre- 
taceous and Tertiary beds. 
Origin and classification of the green sands of New Jersey. 
Jour, of Geol., vol. ii, pp. 161-177. 
Abstract : Am. Geol., vol. xiii, p. 210 ( -I p. ). 
Gives a sketch of the stratigraphic features, describes the several 
formations, and discusses the origin, genesis, and source of the mate- 
rials of the greensands. 
'1 Climatology and physical features of Maryland. 
Maryland State Weather Service, 1st Biennial Kept, for 1892-93, 
pp. 1-146. 
Describes the topography, geologic formations, soils, and climate of 
Marylaud, 
