Mineralogy and Geology. 427 
Under each of these sections, the author takes up separately the physical, 
chemical, and taxonomic divisions of the science; and under the third, 
these divisions are further subdivided for separate treatment. The work 
closes with a history of mineral species, in which the time and author of 
original discovery, and many additional details, are given. 
. Mineralogische Notizen; by Friepricnh Hessenpere, 6 
(finfte Fortsetzung), 42 pp. 4to, with 3 plates. From the Transactions 
of the Senckenburg naturt. Gesellschaft at Frankfort, v, 233.—This con- 
tinuation of Hessenberg’s admirable crystallographic papers includes arti- 
cles on crystals of Hematite, Blende, Malachite, Cassiterite, Sphene, 
Linarite, and Chalcolite. 
7. Note on the volcanic peaks of Cotapaxi and Arequipa ; by J. D. 
Dawa.—In the sketch of the peak of Cotapaxi published by Humboldt, 
the slopes, as deduced from its profile or outline, are 52° on the right and 
50° on the left. Dela Beche copied this figure in his Geological Ob- 
server, with the inclination a little more reduced, viz: to 48° and 45°. 
In photographs of this voleano taken from near La Tacunga, by Camilius 
Farrand, the average angle on the right is 27° 15’, and the steepest 
19° 30’; while on the left, the slope is almost uniformly 30° 50’. In 
another view (see the following figure), from nearly the same direction, but 
taken from the base of the mountain, the greatest slope of the right out- 
oa 
trast between the true slope and its caricature. 
Arequipa, seen from the Carmen Alto, as shown by a photograph pub- 
lished at Lima by the “Sociedad Fotografica,” has a slope of 32° 50! in 
its outline or profile on the right side, and 27° 45! on the left side. The 
Si of this voleanic peak are therefore very nearly the same with those o 
otapaxi, nes 
5 7 angle of 45° in a voleanic cone (such as Humboldt gave in his 
views), could have been made only by ejections of cinders; while slopes 
elow 34°, as are these here referred to, may be a result of ejections of 
of the Haute-Garonne in France, a pelvis of a Dinotherium has been 
found. It is of immense size, being 1-8 metres (5 ft. 11 in. English) 
