Geology and Natural History. 893 
neighborhood of Aachen (Aix la Chapelle) was the center of a 
series of earthquake shocks, which continued from September 28th 
to December 2d; the most violent and extended of them, however, 
took place on the 22d of October. This earthquake has been the 
subject of minute and careful study by v. Lasaulx, and all directly 
or indirectly interested in such matters will find his pamphlet of 
great interest. After giving all the observations made at different 
he discusses the general character of the earthquake, that 
: : : nae Se Cpt 
sion upon t cond point is important and interesting, he says: 
the center of propagation (Ausgangspunkt der Erschiitterung) did 
not lie at h reat that the direct cause of the first 
must have been in the region of the older sedimentary rocks. He 
adds that it is not improbable that it was connected with the 
making of cracks and fissures in the earth’s crust. : 
e seismometer, or scismochronograph, is a little instrument 
. . 
moment of the shock. This is effected by means of a metal ball, 
which is dislodged from its delicate resting-place and sets free a 
spring, which in turn act on the lever. e direction of the 
, With some such apparatus in general use, our observations of 
the time of earthquake phenomena would be much more numerous 
and trustworthy. E. 8. D. 
6. Mineralogische Mittheilungen, gesammelt von G. Tscher- 
mak. Heft u, 1874. Vienna. 77 pp.—Prof. Tschermak is per- 
forming a at service to all mineralogists in collecting and 
valuable contributions. This journal appears quarterly in con- 
it is also published independently. It is now in its fourth year, 
and as the only journal devoted exclusively to mineralogy, 
already holds a high place among scientific serials. The last 
number received is the second issued for 1874, and contains the 
followin TS: 
Siosle ceruale of Albite from the Schneeberg, by J. Rumpf; 
Morphological study on Atacamite, by Edward S. Dana (New 
