952 The American Naturalist. [November, 
yzed by Messrs. Moses and Luquer.” The mineral is of a dark, lead- 
gray color, with a brownish tarnish. Wavellite from the Dunellen 
Phosphate Mine, Marion Co., Fla., contains A1l,O, eae: PO; 
= 33.887%, and H,O = 26.366%. 
Zincite crystals from Sterling, N. J., have again been analyzed. 
Grosser” finds in them ZnO = 96.20; MnO = 6.33; Fe,O, = .43. 
New Instruments.—A new signal for use in goniometrical 
measurements has been introduced to the notice of erystallographers 
‘by Goldschmidt,” which, it is believed, has several advantages over 
the Websky signal. A new adjusting apparatus for the goniometer 
has also been devised by the same crystallographer., It consists of an 
arm movable in four or five directions. By its use all the zones in a 
small crystal may be measured without the necessity of imbedding the 
crystal in wax more than once. A cheap heating apparatus to be used 
with the microscope has been constructed by Schrauf.* It is essen- 
tially a little box of a prain poorly conducting material 
that is heated directly by a gas burne 
Staske” uses a very simple piinasi for the production of curves 
of heat conductivity on mineral plates. It comprises a copper wire 
heated at one end and at the other touching the mineral slice, coated 
with paraffine. 
Miscellaneous Notes.—Another investigation to determine the 
solubility of minerals in water under pressure, in the presence and 
absence of carbon-dioxide, has been made by Binder.* He finds that 
at 90° bornite, chaleocite, marcasite, manganite and fluorite are dis- 
solved to an appreciable extent in pure water, and cinnabar, cuprite, 
and pleonaste to a slight degree only. When CO, is added to the sol- 
vent, pyromorphite dissolves, and epidote in small amounts. Under . 
e same conditions andalusite and anorthite are decomposed. 
The U. S. National Museum has issued a handbook of Geognosy, 
dealing with the materials forming the earth’s crust. In it Mr. Mer 
rill” outlines the charactenstics of the aqueous, solian, metamorphic 
*School of Mines oT No. 3, xiii, p. 287. 
*Zeits. f. Kryst., 1892, xx, p 
*Zeits. f. Kryst., xx, 1892, p. 344. 
%*Ib., xx, 1892, p. 363. 
“IG. xx, p. 216. 
3Min. u. Petrog., Mitth. xii, p. 382 
*Rep. of Nat. Mus. for 1890, p. 503. 
