282 
Progress in Science. 
[April, 
Associated with some of the Andrewsite is a mineral which Prof. Maskelyne 
has referred to Ullmann’s Chalkosiderite. Some crystals from West Phoenix 
have been measured, though with difficulty, by Prof. Maskelyne, who refers 
them to the Anorthic System, and publishes in the “Journal of the Chemical 
Society ” a projection of the faces and a description of the crystals. 
Attention has been called by Mr. Stoddart to the occurrence of gold and 
silver in carboniferous limestone, at Walton, in the neighbourhood of Clifton, 
near Bristol. 
Dr. Hayes has submitted to the American Academy of Sciences a paper in 
which he traces the wide distribution of compounds containing phosphorus 
and vanadium through a great number of sedimentary rocks. Herr Hilger 
has lately determined the presence of lithium in a great number of sedimentary 
rocks. 
To the “ journal of the Chemical Society ” Mr. J. A. Phillips contributes a 
paper descriptive of the well-known pseudomorphic crystals which were 
found seme years ago at Wheal Coates, near St. Agnes, in Cornwall. These 
crystals are pseudomorphs after twins of orthoclase, and are found, on 
microscopic examination, to consist, in some cases, of micaceous plates, 
particles of quartz, and crystals of cassiterite; whilst in others the cassiterite 
predominates, and is associated with blue tourmaline or indicolite. Analyses 
of both varieties are published by Mr. Phillips. 
Mr. R. Pumpelly has described some pseudomorphs of chlorite after garnet, 
which occur abundantly in a bed of chloritic schist, overlying magnetite, in 
the Huronian Series, at Spurr Mountain Iron-mine, Lake Superior. 
Some interesting crystals of Chondrodite, from the Tilley Foster Iron-mine, 
Brewster, New York, have been described by Mr, E. S. Dana. The mode of 
occurrence of the chondrodite at this locality has been described by Prof. 
Dana, but his son now publishes a memoir specially devoted to the crystallo- 
graphic description of the mineral. The great interest of chondrodite lies in 
its relation to the Vesuvian humite, the two minerals being identical in che- 
mical composition and exhibiting closely related crystalline forms. Three 
distindt types of humite have been recognised by Scacchi and Vom Rath, and 
Mr. Dana is enabled to show that all three types are paralleled in chondrodite. 
It is interesting to mark the influence of the Vienna school of crystallography 
on Mr. Dana, his memoirs — whether in Tschermak’s “ Mittheilungen ” or in 
his own Journal — being illustrated by Miller’s symbols, and with stereographic 
projections of the poles of the observed faces. 
A zeolitic mineral, occurring at Neepigon Bay, on the north shore of Lake 
Superior, was described some time ago by Prof. Foote, under the name of 
Zonoclilorite. Mr. Hawes has since analysed this substance, and finds it to 
be merely an impure variety of prehnite. In its mode of occurrence zono- 
chlorite resembles the well-known chlorastrolite, which is found in amyg- 
daloidal trap and in derived pebbles on Isle Royale, Lake Superior. After 
careful microscopic examination of chlorastrolite, Mr. Hawes concludes that 
it is not a homogeneous body, and that a large proportion of xhe stone consists 
of impure chlorite. 
An analysis of a gypsum from White Mountain, in Southern Utah, has 
been contributed to the “ Chemical News” by Dr. Machattie. The gypsum 
contains a notable proportion of carbonate of lime. An analysis of Peruvian 
caliche , or soda-nitre, is published by the same chemist. 
The second Appendix to Prof. Dana’s valuable “ System of Mineralogy,” 
prepared by Mr. E. S. Dana, has just been published, and brings the work up 
to January 1875. 
Geology. — At the Annual General Meeting of the Geological Society, held 
on the 18th of February, the Wollaston Medal was presented to Prof. Huxley, 
in recognition of his distinguished services to geological science. The balance 
of the proceeds of the Wollaston Donation Fund was handed to Mr. J. Gwyn 
Jeffreys, for transmission to Prof. Guiseppe Seguenza, F.C.G.S., of Messina, 
