4 
‘ 
Geology and Natural History. 491 
zine mines at Laurium, Greece, associated with iret ser- 
andirs and several undetermined species. Described by Ber 
Damour.— Bull. Soe. Min. de Franee, iv, Sis 13 6, see 
ortairemiee se ssive, small foliated. G.=6°878. Luster, 
metallic. Color, whitish lead-gray. . Opaque. Kbaipria (after 
deducting impurities), S 17°63, Bi 56 ‘97, Sb 0°62, Pb 11°79, Ag 
8°74, Cu 3°46, Zn 0°79=100; another analysis gave 3 p. ¢. Ag, an 
5°38 p.c. Cu. The formula deduced is (R,R)S+ Bi,S,. Occurs 
intimately mixed with quartz, barite, chaleopyrite and tetrahe- 
drite at the Alaska mine, Poughkeepsie Gulch, Colorado. 
aig ies by G. A. Kon —Amer. Phil. Soe. Phiiad., 1881, 472. 
Artificial jormation of the Potash ene Orthoclase ; soDy 
C. i ee and |} wn (Bull. 8 e Fra nce, iv, 171). 
—The process aed i hese Shethiae i the dar: ‘of ortho- 
clase in crystals consisted in heating together in a tube of steel 
having red copper within, for 15 to 20 hours to a temperature 
i 
and another of a potassium silicate rich in alkali. gher 
temperature was disadvantageous, it producing a poe a eben 
of the silica either as quartz, or as tridymite. The 8 gave a 
gave for the specific oravity that of pembitad An analysis 
afforded alumina 15°59, potash 14°38, leaving for ‘as silica 70°03. 
There is here an excess of silica of 6°30 per cent, which was due 
to the presence of some free silica; the other ingredients have the 
orthoclase proportions. The authors did not succeed when the 
mixture was made to consist of sae alumina and potash, in the 
pe age Poe they have in orthocla 
0. English Plant-Names Pou the Tenth to _ Fifteenth Cen- 
. ay By Joun Earn, M.A., Rector of Swanswick, Professor 
of ee in University of Oxford. Oxford : “Claren don 
sisting in the fen lace >—yet in the volume occupying the last 
1 
of making a book. To this is prefixed an Introduction, on the 
history of plant-names from Theophrastus down to the modern 
system of nomenclature; the signification of the old native plant- 
names; their volun to the Roman ones ; haar pee elements 
of English plant-names; on the neglect of vernacular names, ete. 
the matters linguistic we are not now t Ape ; and probably 
Professor Earle is only a superficial botanist. But his sketch of 
the history of nomenclature, and of the development of 
> 
is as critically excellent as it is terse and fres 
of nothing half so good within so small a compass, en we be- 
gin to understand “ the fascination of vernacular plant-names,” 
which, as the author remarks, “ has its foundation in two instincts, 
