376 General Notes. | April, 
more frequent constituent of the andesites of this region than has 
hitherto been supposed——Quite an addition to our knowledge 
of the metamorphoric rocks has recently been made in the 
- articles of Von Miklucho-Maclay! and Joseph Gotz? The former 
treats of the schists found on the River Witim, in East Siberia. 
of the ottrelite and andalusite, which took place contemporane- 
ously with the assumption of the schistosity. Thus much addi- 
s 
regional metamorphism, called by Lossen’ dislocation metamorph- 
ism, to which s 
leading German petrographers. 
MINERALOGICAL News.—In a late number of the Neues Jahr- 
buch, Max Bauer publishes the continuation of his studies 1n 
mineralogy. In this paper he describes pseudomorphs of calcite 
after aragonite from Klein-Sachsenheim, in Württemberg. In all 
instances of this kind heretofore described the rhombic substance 
rearrangement and thus to have passed over into rhombohedral 
calcite. A study of the Klein-Sachsenheimer crystals and the 
mode of their occurrence shows, however, that in some cases at 
least, a solution and deposition takes place.. These crystals are 
- found in a drusy dolomite, which originally contained in it lens- 
water, and it was from this solution that the aragonite was de- 
posited on the sides of the hollows left5 At the same time, 
there was a deposition of brown spar, which covered the 
1 Ib., 1885, I, p. 145. 
2 Ib., Beil., Bd. rv, p. rio. 
3 Zeits. d. deutsch. geol. Gesellschaft, xxt, p. 324- 
* Band 1, 1886, p. 62. 
-~ "5 From very dilute solutions or from those containing small amounts of gyprs 
_ calcium carbonate is deposited as aragonite, while from concentrated solutions = 
_ those containing no foreign matter it is ited as calci sae 
~ 
