No. 388.] REVIEWS OF RECENT LITERATURE. 353 
have the analysis of the glass from the upper part, and under (III) 
that of the glass from the lower portion. 
SiOz AlO Fe2O3 CaO MgO KeO NaO Total. Sp. Gr. 
(I) 68.9 19.7 1.4 1,2 1.0 Se. se 2206 2.716 
(il). 73.65." 14-08 233 1.04 OS eOr 356 = 909.12 234 
(III) soro 92.90 GOF 371 L39 J20 "s40 = 9803 2484 
The Basic Rocks of Ivrea. — The basis rocks in the neighbor- 
hood of Ivrea, on the south side of the Alps, are shown by Schaefer ' 
to be the result of cooling of a single magma. ‘This yielded norites, 
diorites, gabbros, peridotites and both basic and acid dyke-rocks. 
The norites include hornblendic varieties, and the diorites, bronzitic, 
hornblendic, and biotitic phases. All these rocks have been subjected - 
to the action of mountain-making forces. The norites have be- 
come schistose without suffering any essential mineralogical change. 
Some of the diorites have simply been made schistose, others have 
undergone a further change in that their dark, compact hornblende 
has passed over into a light green amphibole, while a final stage of 
alteration is represented by green schists, composed of zoisite, 
plagioclase, actinolite, chlorite, and epidote. 
The dyke rocks cut the large basic masses and are always closely 
related to them chemically. The principal types are a labradorite 
(Labradorfels) and a fine-grained black rock which the author calls 
valbellite. This is made up of bronzite, olivine, and brown horn- 
blende with pyrrhotite, spinel, and magnetite as accessories. 
The Basalts of Steiermark. — Sigmund’s? studies on the basalts 
of Steiermark are continued in an article in which are described the 
magma-basalts and basalt-tuffs of Fiirstenfeld and the feldspar basalt 
of Weitendorf. The composition of the magma-basalt is shown by 
the figures below. 
SiOz TiOg FegO3 FeO AlO CaO MgO NagO KeO CO H20 Total. 
O70 teo $35 502 1703 Bag 73i 353. 220 133 133 = 10008 
Petrographical Notes. — Reinisch è has found a specimen of tes- 
chenite in the museum at Minussinsk. It is labeled as having come 
from east of the salt lake Staniza on the river Bjelyi-Jjuss, Minussinsk 
parish, Jenisseisk gouvernement, East Siberia. It resembles very 
closely the West Carpathian rock. Among the other specimens from 
1 Min. u. Petrog. Mitth., vol. xvii, p. 495. 
2 Ibid., p. 256. 
8 Ibid., vol. xviii, p. 92. 
