1078 — The American Naturalist. [December, 
the editor and translator of one of the very earliest text-books published 
in America on the subject of histology. That the successive occupants 
of the chair of Anatomy in the University of Pennsylvania should 
have taken such an important share in fostering the development of 
histological study in America, should be a matter of pride to all who 
are interested in scientific and educational progress.—R. 
First Annual Report for 1892, Iowa State Geological 
Survey.’—A quarto volume of 474 pages containing the administra- 
tive reports, and accompanying papers illustrated by a number of maps 
and sections, some of them colored, and a number of photo-gravures. 
Of these papers Mr. Charles Keys contributes three: (1) A summary 
of the present knowledge of the Geological formations of Iowa; (2) 
An Annotated Catalogue of Minerals; (3) A Bibliography of Iowa 
Geology arranged in the form of a dictionary catalogue. The remain- 
ing three embody the observations of Mr. S. W. Beyer on the Ancient 
Lava Flows in the Strata of Iowa, Mr. H. F. Bain's studies of the 
Distribution and Relations of the St. Louis Limestone in Mahaska 
County, Iowa, and notes on Niagara Lime-burning Dolomites and Dolo- 
mitic Building Stones of Iowa by G. L. Houser. 
The Paleozoic Group of Georgia.—Dr. J. W. Spencer's 
report on the work of the Geological Survey of Georgia is confined to 
a detailed statement of the geology and economie resources of the 
Paleozoie Group developed in the northwestern Counties of Georgia. 
Under the head of Geology, the author gives the general characters of 
the systems of this group as exemplified in the region under discussion, 
the recent formations and evolution of northwestern Georgia, the phys- 
ieal features of the country underlaid by Paleozoie rocks, and the 
local geology of the different countries embraced in the Paleozoic belt. 
Under Economie Resources the distribution and modes of oceurrence, 
and the character of red and brown iron ores, manganese and alumi- 
num ores, coals,building and paving materials, variability of soils, and 
 water-powers of the country are set forth. In the closing chapter Dr. 
Spencer gives a bibliography of Georgia geology and a statement of 
the progress of the survey. : 
. The report is illustrated by 10 plates, 34 cuts, and a geological map. 
? Iowa Geol. Survey, Vol. I, First Annual Report for 1892, with Accompanying 
Papers, Des Moines, 1893. 
* The Paleozoic Group. The Geology of Ten Counties of Northwestern Georgia 
and Resources. By J. W. Spencer, A. M, Ph. D. F.G.S. (L. and A.) Report of 
the Geographical Survey of Georgia, Atlanta, 1893. 
