272 PETROLOGICAL ABSTRACTS AND REVIEWS 
great suites, the Atlantic and the Pacific, the authors would add to these 
another, the spilitic suite. This association of rocks is characteristic 
of regions which have undergone long-continued and gentle subsidence 
with no important folding. They belong to a natural family that can 
be clearly distinguished from the Atlantic and Pacific suites. 
The constant association of adinoles (albitized shales) with the albi- 
tized igneous rocks furnishes a strong confirmation of the theory that 
there was a great addition of soda after the consolidation of the igneous 
rocks through the agency of magmatic waters. 
ER Lroyp 
JOHNSTON, J., AND ApAms, L. H. “Influence of Pressure on the 
Melting-Points of Certain Metals,” Amer. Jour. Sci., XX XI 
(1911), 501-17. 
The paper describes at considerable length a highly efficient apparatus 
for measuring melting-points with an accuracy of five atmospheres and 
of .o2°. Pressures up to 2,000 atmospheres may be produced, and are 
transmitted by a high-boiling paraffin oil, the use of this agent enjoining 
a temperature of 400° as a maximum. The change of pressure of the 
melting-points of the only four metals melting below 400°, viz., tin, 
bismuth, lead, and cadmium are given; it was found to be a linear 
function of the pressure. The latent heat and volume change on melting 
of these four metals is also computed. 
G. S. ROGERS 
Kraus, Epwarp H. ‘A New Jolly Balance,’ Amer. Jour. Sct., 
XXXI (1911), 561-63. | 
The new features of this balance reduce the number of readings 
necessary for the determination of specific gravity and record the elonga- 
tion of the spiral spring so that verification of the readings is possible. 
HaArRoLtp E. CULVER 
Mircu, L. “Die heutigen Ansichten tiber Wesen und Enstehung 
der kristallinen Schiefer.”’ Geologische Rundschau, Band I, 
Hefte 21s ae pp. 30-56: 
L. Milch aims at an impartial presentation of the views of various 
investigators on the nature and origin of the crystalline schists, with a 
bibliography of the most important papers. 
He points out that two of the fundamental problems of the origin 
