Authors Catalogue. 321 
NaAlSi20o.H20. The conclusion from the probable structural for- 
mula is that analcite is a member of the garnet-sodalite group. 
M. L. F. 
The Mineralogical Structure and Chetnical Composition of the 
Trap of Rocky Hill, N.J. By Alexander Hamilton Phillips. 
{Am. J. Sci., 158, 267-285.) 
Numerous analyses of the trap and of several of the component 
minerals are given. The trap occurs in the form of a dike and in 
general appearance resembles a doleryte. In composition, however, 
it approaches closely to dioryte but with border phases allied to 
diabase. .m. l. f. 
Some Analyses of Italian I'olcanic Rocks. \. By Henry S. 
Washington. (Am. J. Sci., 158, 286-294.) 
The analyses of the trachytes of the Phlegraean Fields and Ischia 
indicate that these volcanic rocks afe not genetically related to the 
closely adjacent rocks of Somma and Vesuvius, but are connected 
with a second and older fracture line extending from Capraia to Sicily 
and covered largely by the waters of the Mediterranean. The rocks 
of this latter fracture show an excess of Na^O over K2O, while in the 
former K2O and CaO predominate. A third fracture line, the oldest 
of the three, occurs far out in the Mediterranean and is characterized 
by rocks very high in Na-jO and possessing several peculiar sodium 
minerals. M- l. f. 
Mineralogical Notes: Meloiiite, Coloradoitc, Petzite, Hessitc. By 
W. F. HiLLEBRAND. (Am. J. Sci., 158, 295-298.) 
An analysis of a nickel telluride from the Mother Lode region of 
California gave the formula NiTe2, and is regarded by the author as 
probably identical with the melonite (Ni2Te3) of Genth which was ob- 
tained from the same locality. Other minerals recognized from this 
locality were coloradoite, petzite, and hessite. Analyses are given for 
the last two. m. l. f. 
MONTHLY AUTHORS' CATALOGUE 
OF American Geological Literature. 
Arranged Alphabetically.* 
Ami, H. M. 
On some Cambro-Silurian and Silurian fossils from lake Tcmiscani- 
ing, lake Nipissing and Mattawa. (Ann. Rep. Geo!. Sur. Can., vol. 10, 
part I, appendix 2, pp. 282-301, Ottawa, Sept. 1899.) 
*Tliis list includes titles of articles received up to the 20th of the preceding 
month, including general geology, physiography, paleontology, petrology and 
Tnineralogy. 
