274 Progress in Sctence. [April, 
from Mancayan, in the island of Luzon, to which the name of Luzonite has 
been given. It occurs, associated with enargite, in veins of copper ore. Dr. 
C. Winkler’s analysis shows that it is an arsenio-sulphide of copper, having 
essentially the same composition as enargite, which is consequently dimor- 
phous. 
Rauite is the name which has been bestowed upon a new zeolitic mineral 
from Brevig, in Norway, described by Herr Paykull. It appears to be closely 
related to Thomsonite, and to resuit from the alteration of Elzolite. 
Some interesting pseudomorphs from the Tilley Fort Iron Mines, in Putnam 
Co., New York, have been described in the “‘ American Journal of Science ’’ 
by Prof. Dana. After sketching the geological structure of the district, he 
describes the several kinds of pseudomorphs; some consisting of serpentine, 
or of serpentine and dolomite, whilst others are composed of brucite, mag- 
netite, pyrrhotite, &c. 
Dr. J. Lawrence Smith has called attention to a curious association of 
essonite, or cinnamon-stone,—a variety of garnet,—and green idocrase, with 
datholite, in limestone, at Santa Clara, California. This is the first instance 
in which datholite has been observed in association with garnet and idocrase. 
Analyses are published ef the several minerals here described. 
By the same chemist we have a note on Warwickite, recently presented to 
the French Academy. This rare mineral is a boro-titanate of magnesia and 
iron, originally described by Shepard. . 
It may be interesting to the mineralogist to know that M. Radominski has 
succeeded in artificially producing the two rare minerals monazite and 
xenotime. The former is a phosphate of cerium, lanthanium, and didymium, 
whilst the latter is a phosphate of yttrium with the monazite metals. 
Some notes by Mr. W. Skey, of New Zealand, contributed to the “* Chemical 
News,” are of much interest to the mineralogist, from their bearing upon the 
origin of Torbanite, or the celebrated Torbane Hill mineral. By allowing 
petroleum to filter through clay, he obtained a substance strikingly resembling 
the natural mineral, and he concludes that Torbanite is not a coal, but a 
chemical combination of an acid hydrocarbon with silicate of alumina. 
Attention has recently been called by M. Daubrée to some highly interesting 
examples of the formation of metallic minerals within a comparatively recent 
period. M. Daubrée’s observations on the minerals formed in the Roman 
works at the hot springs at Plombiéres are well known; but the present illus- 
traiions have been presented by the hot springs of Bourbonne-les-Bains, in 
the Department of the Haute Marne. It appears that during some recent 
excavations the bottom of the old Roman well was laid bare, exposing a bed 
of mud, in which a number of bronze, silver, and gold antiquities were disco- 
vered. This bed rested on a deposit of fragments of rock cemented into a 
brecciated mass by the crystallised metallic sulphides, Among these were 
found examples of copper-pyrites (sulphide of copper and iron), copper-glance 
or vitreous copper-ore (disulphide of copper), purple copper-ore or erubexite 
(sulphide of cepper and iron), and fahlerz or tetrahedrite (sulphide of copper 
and antimony). It is true that most of these had been found in other locali- 
ties, under somewhat similar circumstances, but the occurrence of the fahlerz 
in sharp tetrahedral crystals has not been previously recorded from any depo- 
sits of this chara@er. Altogether the association is strikingly like that in 
some of our old copper-lodes, yet the deposit in question is certainly not older 
than sixteen hundred years. The bronze objets have been much attacked, 
but the silver has not been affected. 
GEOLOGY. 
Physical Geology.—The plant-bearing series of India has been shown by 
Mr. H. F. Blanford to range from early Permian to the latest Jurassic times, 
indicating that, with few and local exceptions, land and fresh-water conditions 
had prevailed uninterruptedly over its area during this long lapse of time, and 
