LIST OF PUBLICATIONS. 
Rosz, J. N., and J. A. Purpus. Three 
new species of Echeveria from southern 
Mexico. 
Contr. U. S. Nat. Herb., 13, Pt. 2, 
Feb. 21, 1910, pp. 45, 46, pls. 
10-14. 
—— (See also under N. L. Britton and 
J. M. Coulter.) 
143 
UNvDERWoopD, Lucien M., and Wr1am 
R. Maxon. Cyatheacese [of North 
America]. 
North Amer. Flora, 16, Nov. 6, 
1909, pp. 65-68. 
Includes treatment of the genus Cya- 
thea, with 3 new species. 
GEOLOGY AND MINERALOGY. 
BassterR, R.S. The cement resources of 
Virginia west of the Blue Ridge. 
Virginia Geol. Surv., Bull. No. 
2-A, 1909, pp. 1-309, pls. 1-30, 
figs. 1-30. 
This report deals essentially with the 
limestones and shales—the cement-mak- 
ing rocks—of Appalachian Virginia, 
although the stratigraphy of all the rocks 
has been described in some detail. The 
Cambro-Ordovician rocks have received 
most attention, although the post-Ordo- 
vician rocks are discussed. Since practi- 
cally nothing concerning the Paleozoic 
fossils of Virginia has appeared in the 
literature, plates of fossils, based upon 
Museum specimens, are inserted. 
MERRILL, GEORGE P. A heretofore unde- 
scribed stony meteorite from Thomson, 
McDuffie County, Ga. 
Smithsonian Misc. Colls., 52, 
Quar. issue, Pt. 4, No. 1881, 
Dec. 2, 1909, pp. 473-476, pls. 
52, 53. 
Describes briefly the mineral composi- 
tion and structure of the stone and calls 
attention to an apparent case of secondary 
filling of a vein cavity by pyrite. 
Prate, AtBert ©. On the application 
of the term Laramie. 
Amer. Journ. Sci., 4th ser., 28, 
July, 1909, pp. 45-58. 
Pocus, JosrpH E. Geology and struc- 
ture of the ancient volcanic rocks of 
Davidson County, N. C. 
Amer. Journ. Sci., 28, Sept., 
1909, pp. 218-238, figs. 1-3. 
The geology of a portion of the Pied- 
mont Plateau of North Carolina, compris- 
ing the beveled folds of a great volcano- 
sedimentary series, is given. The follow- 
ing rock types are described: slate, acid 
fine tuff, acid coarse tuff, acid volcanic 
breccia, rhyolite (with chemical analysis), 
dacite (with chemical analysis), andesitic 
fine tuff, andesitic coarse tuff and breccia, 
~ andesite (with chemical analysis), gabbro, 
and diabase (with chemical analysis). 
The article concludes with a discussion of 
Poaur, JosrrpH E.—Continued. 
the structure and geologic history. It is 
based partly on material in the U. S. 
National Museum. 
Crystallographic notes on calcite. 
Smithsonian Misc. Colls., 52, 
Quar. issue, Pt. 4, No. 1878, 
Sept. 24, 1909, pp. 465-468, pls. 
53, 54. 
Crystallographic descriptions of (1) two 
specimens calcite from Joplin, Mo., (2) 
calcite with moving bubble from Guana- 
juato, Mexico, and (3) small crystals of 
calcite from Virgilina, Va. 
— On a remarkable cube of pyrite, 
carrying crystallized gold and galena of 
unusual habit. 
Smithsonian Misc. Colls., 52, 
Quar. issue, Pt. 4, No. 1882, 
Dec. 22, 1909, pp. 477-484, pl. 59, 
figs. 81-85. 
A description, with consideration of its 
crystallographic features, of a 2-inch cube 
of pyrite from Juneau, Alaska, the surface 
of which is studded with easily visible, 
clear-cut crystals of native gold and partly 
covered with plates of galena unusually 
laminated. 
On olivine-diabase from Davidson 
County, N.C. 
Proc. U. S. Nat. Mus., 37, No. 
1715, Jan. 19, 1910, pp. 475-484, 
pl. 37. 
A petrographic description, including a 
discussion of the chemical composition, a 
classification according to the quantita- 
tive system, and the literature on olivine- 
diabase occurring in the United States. 
On sand-barites from Kharga, 
Egypt. 
Proc. U. S. Nat. Mus., 38, No. 
1726, Apr. 30, 1910, pp. 17-24, 
pl. 9, 1 fig. 
An account of the crystallographic, mi- 
croscopic, and chemical character of a 
large suite of crystals from the Libyan 
Desert of northeast Africa. Includes a 
review of the literature on sand barites 
and baritic sandstones. 
