Recent PMlcations. 263 
till now, except by those who reject the Taconic system. He finally 
reaches the conclusion that the ores (in particular the ore of manganese, 
although the conclusion involves that of iron because of their intimate 
association) were the result primarily of chemical precipitation in the 
ocean at the time of the formation of the rocks themselves, and that the 
oceanic waters obtained the manganese principally from the disintegra- 
tion of the older crj'stalline rocks of the region. 
The report is faultless in method and execution, and the value of its 
scientific conclusions, and of its accurate and conscientious descriptions 
of Arkansas localities cannot fail to be highly appreciated by the citizens 
of that state. It is, moreover, a real contribution to the geology of the 
country, and adds one more to the series of valuable results of the 
Arkansas survey. 
RECENT PUBLICATIONS. 
I. Stdte (Old Government Reports. 
Geol. Sur. of Missouri, Bulletin No. 5, contains: The age and origin of 
the crystalline rocks of Missouri, Erasmus Haworth; Notes on the clays 
and building stones of certain western-central counties tributary to Kan- 
sas City, G. E. Ladd. 
Advance sheets from the 17th report of the Geological Survey of the 
State of Indiana; Pateontology, S. A. Miller, 113 pp., 22 plates. 
Geol. Survey of Georgia, First report of Progress, 1890-91. J. W. 
Spencer. 
Bulletin No. 80, U. S. Survey. Correlation papers, Devonian and Car- 
boniferous, Henry S. Williams. 
Second annual report of the Geological Survey of Texas, E. T. Dum- 
ble, contains, besides the report of the state geologist, the following 
papers: Reports on the iron ore district of East Texas; Carboniferous 
cepholopods, A. Hyatt; Report on the geology of northwestern Texas, 
W. F. Cummins; Report on the geology and mineral resources of the 
central mineral region of Texas, Theo. B. Comstock; Report on the 
geology and mineral resources of Trans-Pecos Texas, W. H. Von 
Strearirwitz. 
II. Proceedings of Scientific Societies. 
Trans. N. Y. Acad. Sciences. Feb-March, contains: The man of Spy, 
or newly discovered paleolithic skeletons from the vicinity of Liege. 
Belgium. J.S.Newberry; The tin deposits of North Carolina. John 
H. Furman. April to June: Amber, its history, occurrence and use, J. 
S. Newberry; Remarks on recent discoveries in local Cretaceous and 
Quaternary geology, N. L. Britton; The Pipe-creek meteorite, A. R. 
Ledoux. 
Jour. Cin. Soc. Nat. Hist., July, 1891, contains: On the age of the Pt. 
Pleasant, Ohio, beds, Jos. F. James. 
