462 Scientific Intelligence. 
That at the great period when the chromiferous chrysolite beds 
(in part subsequently altered into serpentine, etc.) were deposited, 
a large quantity of alumina was separated which formed beds of 
corundum$ 
That this corundum has subsequently been acted upon and 
thus been changed into various minerals, such as spinel, fibrolite, 
eyanite, and perhaps into some varieties of feldspar, also into 
tourmaline, damourite, chlorite and margarite ; 
That a part of the products of the alteration of corundum 
still exists in the form of large beds of mica—(damourite) and 
chlorite—slates or schists ; 
hat another part has been further altered and converted into 
other minerals and rocks, such as pyrophyllite, paragonite, beaux- 
ite, lazulite, ete. 
2. (1) Geological Survey of Illinois, A, H. Worthen, Director. 
Volume V, Geology and Paleontology: Geology by A. H. Wor- 
THEN and James Suaw; Paleontology by F. B. Mme« and A. H. 
Worrnen. 619 pp. large 8vo, with 32 lithographic plates. Spring- 
field (Illinois), 1873. 
(2) Report of the Geological Survey of Ohio. Part IL of Volume 
I, Paleontology. Descriptions of Invertebrate Fossils of the Silu- 
rian and Devonian Systems, by F. B. Merk. Descriptions of 
Fossil Plants and Fossil Fishes, by J. S. Newperry. 402 pp. 
large 8vo. Columbus, 1873. 
These two volumes will be welcomed by the geologists of the 
and of thorough knowledge of the subject, as well as of artistic 
<= 
many important facts are given respecting the lead mines, the 
various rock formations, the drift, building material, soil, prairies, 
Ossi carbo ou 
adding largely to the number illustrated in the earlier volumes ; 
also several Paleechinoids and Star fishes, and many M 
The fidelity and science of Mr. Meek appear in all parts of 
the paleontology. : 
The General Geology of the State of Ohio having been described, 
the volume now issued is devoted to the Paleontology of the State, 
which subject is here only commenced. The State is especially 
