194 Second Supplement to Dana’s Mineralogy. 
is one of the best er beers che wi pene eraly and practically} of Europe, 
= ¥ = — for chemistry eon he is engaged on the crystals “ laboratory prog ucts. 
is extensive, the gtk eed s numerous and exact, and the whole erys- 
aliaton of each pro oduet is ie tharos sei made nie and dasetibs .d. The figures are 
drawn with great precision and bea Like th “apne es: on Euclase, 
each sabe he takes up is finished “wen it leaves = 
: Die Gesteinlehre yon Bernhard Cot Prof Geog. zu Freiberg. 256 
pp. ong Freiberg, 1855.—A valuable work on gh 
2. Crystallography, Formation of Minerals, etc. 
On the Lapa Sahe eral Species ; by M. ice 38 PP. a o. Paris, 
inga —This paper, although published i . 1854, mas! read, as it states, at the Acade- 
of Sciences on the 14th of April, ssor Delafoces ties “ora 
ae similar in many respects to on published by Bei writer in this Jour- 
vol. xviii; the optics of his es onths rae: but in 
reading of it, he has the priority. The incite: pa - cai *t is one of great inter- 
est, is, the re se in Ee gn between upecios of the inequiaxial bywtegie of crystal- , 
lization, and the forms of the monometric or t esseral system. Various groups 0 
pse udomorph ous i fo are mentioned, and approximations in angle in hexagonal, 
dimetrie, trimetric he oblique erystals, to the a aa octahedron or dodecahe- 
ad are pointe 
On the nrtificial production of mineral dilidates and et by the reaction of 
vapors upon rocks; by M. Dausrée, Comptes Rend., July, 1854, p. 135, and Ph il 
Mag. [4], ix, 315.—The waar shows that by ithe action of chlorid of silicon in vapor 
on the req red bases, crys stals may be obtained of the species otastonite, chr 
; i arnet, 
3 i affords specular iron; or with chlorid of zine, it sem ee : 8 chlori 
slum acting on lime affords periclase, a known v' roduct. 
: 3b 
ime corundum, in crys ‘ 
Chlorid of titanium affords in like manner brookite; perc of iron — lime 
p.¢, or ay p.c. af e prele: in carbonated waters (pure water, trough whi 
for 6 days and 134 hours © had been passed), it lost 0:0136 p- ¢., or zl. p. ey of Si. 
of ammonia ge 95 of water, the loss is 0:02 parts or J, p. * eae A very 
‘int solution * career of ammonia containing only 1 p. c. fs Joss was 0-062 
, or about 51, p. ¢ 
Again 100 parts of sal ammonia which contained 19°2 p.c. of dry ammonia, 
loss was 0:071 parts, or about t =4, p.c.; and with only 1°6 p. ¢. 0 f dry ammonia, 
00986 3 ¢. or beso zo pc -. Si. 
pond approximately with those of J. Fuchs (Ann. d. aa 
i, 119), ae found that 100 parts of cold water neti 0-013 of 51, 
te 2 muriatic acid of 1115 sp. gr. only 0-009 p. ¢. of Si obvious conclu- 
ligot finds that 50,000 parts of pure water dissolve 
A ese June, 1855 : 
od of rater ‘small crystals; by W. Hatprvaer, (Sitz., Wien, 
Fsethod <p pee lor cry: — which cannot = otherwise measured, * 
| oo eo n paper parallel _ — or faces 
ed, a ar e inclination of these Ii 
oe Organs f pig de of the Carbon priereee F, H. Scurd- 
ism. ; <i EERER, Pie: Xcy, 
Ueber ions bor Krystal by von FRANKENHEIM, is 347. nk 
On the formation of crystals with wake ; H, Korr, Ann. d. Ch. u. arm, xciv, 
