Reviezu of Recent Geological Literature. 125 
clase, with biotite and graphite, and still another ilmenite, allanite and 
epidote. The limestone is mar-morized and garnetized with reddish 
yellow grossulaire in large rhombcdodecahedrons. In other places it 
is rich with epidote and hairy idocrase, with wollastonite, diopside, 
chabazite and stilbitc. In these modifications sometimes microcline and 
sometimes quartz is in the last mineral formed. Epidote increases to 
form epidolyte. It is then granulitic and pyroxenic. Sometimes it is 
rich in sphene, diopside and blue tourmaline. The limestones also take 
the form of compact dense feldspathic rocks derived from thin alter- 
nating beds of limestone and of schist, constituting a banded horn- 
stone. Talc appears also as a product of such modifications, and beds 
of magnetite as a pneumatolitic product at the contact planes. In the 
marble are also veins of aplyte and pegmatyte. These veins are not 
derived from injection from the granitic magma, but from slow mole- 
cylar filling of fissures by the action of mineralizing waters. 
3. Along the northern slopes of the granitic massif the exomor- 
phism is less, and the granite is much decayed and granulated. It 
contacts on Silurian schists and Premo-Carboniferous and Devonian 
limestones and on Secondary limestones. The modified sedimentaries 
present essentially the same characters as on the south side. 
4. The granite passes progressively to hornblende granite, then to 
quartz dioryte, to basic' dioryte and to hornblendytes, including noryte 
and hornblendic peridotyte. 
5. These several rocks are separated, in different stages of alter- 
ations, from the normal granite, by a form of granite containing in- 
clusions showing different degrees of exomorphism. 
6. There is a clear, close connection between the nature of the 
sedimentaries adjacent and these inclusions, indicating their source. 
7. It is logical, therefore, to consider these inclusions sometimes 
as fragments from the sedimentaries highly exomorphosed or some- 
times as portions of the granitic magma endomorphosed by the diges- 
tion of such fragments. Yet they approach so closely together in min- 
eral nature that sometimes their source whether in the magma or in the 
sedimentaries cannot be distinguished. 
8. The granitic magma could have absorbed a great quantity of 
the schists without having its mean composition much altered. 
9. The absorption of calcareous sediments produces intermediate 
phases of basicity in the granitic magma. 
These conclusions bear directly on the theoretical origin of the 
basic and intermediate eruptive rocks, and seem to render the notion 
of magmatic differentiation unnecessary, and at this place inapplicable. 
At the same time it should be noted that Prof. Lacroix does not per- 
mit himself to universalize these results, but states that every case must 
be studied by itself. x. if. w. 
Gcologischer Fuhrer durch Cm^panicn. Von Dr. W. Deecke. 
This is No. 8 of the collection of geological guides published by 
Gebriider Borntraeger, Berlin, iror. Costs 4 marks. This guide 
would be particularly valuable to tourists interested in volcanic phe- 
