1194 The American Naturalist. [December, 
Miers 9 shows that stephanite is not hemihedral, but that its crystals are 
usually twinned hemimorphic forms. Brief descriptions of cerus- 
site, anglesite, and calcite crystals from the Diepenlinchen Mine, near 
Stolberg, are given by Dannenberg.** Phenacite and topaz, the latter 
altering into damourite, occur at Amelia Court House, Va. On the 
former mineral from Hebron, Me., Mr. Yeates 3 has discovered the basal 
plane. Prof. Dana % finds that the barium sulphate from Perkin’s 
Mills, Templeton, Can., described by Lacroix as a monoclinic dim- 
orph of barite under the name michel-levyte, is really orthorhombic, 
and therefore true da77#e, and that the peculiar striations observed on it 
are probably due to pressure. Minute crystals of jarosite line cavi- 
ties in a siliceous Amonite at the Mammoth Mine, Utah.” Thenar- 
dite, glauberite, and calcium carbonate pseudomorphs of the last-named 
mineral form thick deposits in a lake-like depression in the Verde 
Valley, Ariz. Mr. Blake, to whom we owe this knowledge, mentions 
also the existence of dournonite at the Bogg’s Mine, Yavipai (?) Co., in 
the same State. Heddle ® declares that d7zmachite of Wallace, oc- 
curring in veins in a conglomerate in Inverneshire, is fluorite. The 
same author‘! has made a very superficial examination of two crystals 
of gyrolte from the Freshinish Islands, near Mull, England, and 
pronounces them probably monoclinic. Solly records his meas- 
urements of struvite crystals formed by micro-organisms in gelatine 
culture tubes, 
Miscellaneous.—Messrs. Gattermann and Ritschke,2 in their 
work on Azoxyphenolether, have obtained a substance which they call 
anisolazoxyphenetol. This substance, though liquid, appears to possess 
many of the characteristics of crystals. Its drops are doubly refrac- 
tive and dichroic. In a very interesting communication Rinne 
shows that the oxides of the metals are isomorphous with their corre- 
sponding sulphides, a view that is in perfect harmony with the chemical 
relations existing between oxygen and sulphur. The minerals thus 
thought to be isomorphous are zincite and wurtzite, valentinite and 
33 Ib., XVIIL, p. 68. 
% Ib., XVIIL, p. 64. 
mer. Jour. Sci., Apr., 1890, p. 325. 
% Amer. Jour. Sci., Jan., 1890, p. 61. 
# Genth. Ib., p. 73. 
% Ib., 1890, p. gc 
9 Miner. Mag., Oct. 
deutsch. chem. Ges., 1890, p. 1738. 
© Zoits, d. deutsch. geol, Ga. XLII., 1890, p. 62. 
