152 Scientific Intelligence. 
existence of a dome as twinning plane, with an angle of 44° 45’, 
and giving the axial ratio 1:0°991. Irregularities in the optical 
properties of analcite were observed by Brewster. E. 8. D. 
Angewandte Krystallographie (Ausbildung der Krystalle, 
Lwillingsbildung, Krystallotektonik) nebst einem Anhange tber 
Zonenlehre, von A. SavEBECK. 284 pp. 8vo, with 23 plates, 
Berlin. 1876.—The present volume forms pro erly the second 
part of the Elements of Crystallography (of G. Rose) published 
by Prof. Sadebeck in 1873. The object of the work is to describe 
crystals as they actually appear in nature, not the ideal forms 
which are of only theoretical existence. The special subjects con- 
sidered are: 1. hemimorphism and seudo-symmetry, the latter 
also in the interior of crystals. This last subject is one of great 
theoretical interest, and in the discussion of it the author has in- 
troduced much matter which is new obtained from his own exten- 
Sive researches ; it is elucidated b many excellent figures. 
Th 
ast chapter of the work discusses the subject of zones, considered 
E. S. D. 
19. New Journal devoted to Mineralogy and Crystallography. 
—Professor Grot , in a letter to the editors dated Strasbourg, 
May 28th, 1876, announces the commencement of a new Journal 
for special miner alog e plan of this Journal embraces the 
followin cts :—theoretical, physical and chemical crystallog- 
raphy; investigations regard to artificial crystals; mono 
mination under the microscope; in a word the Journal will cover 
the whole field of mineralogy, with the exclusion of geology: 
wherever publis There are to be from six to eight numbers 
ng ear, appearing every six er eigh with the ex- 
clusion of the vacation months, e chief editorial duty will 
performed by Prof. Groth, with the especial codperation 0 
vom Rath of Bonn, and Prof, Klein of Heidelberg. The pub 
lisher is Engelmann of Lei zig. + thi 
The plan deserves the oe support of all interested in this 
department of science, 
