Recent Publications. 125 
The timber resources of Minnesota are discussed by Mr. H. B. Aj'res, 
agent of the Forestry Division, U. S, Department of Agriculture. 
Though the average number of men employed in the state in preparing 
forest products for market reaches about 17,000, and the value of the an- 
nual product about $31,635,000, it is confidently affirmed that this indus- 
try and its supply need not soon decline, if the forest lands should 
receive legislative attention and proper care, as in some European coun- 
tries. 
Other divisions of this report comprise a valuable catalogue of the 
meteorites in the State University collection, with references to litera- 
ture d- scribing them; notes on the petrography and geology of the 
Akeley lake region, in northeastern Minnesota, by W. S. Bayley; and 
descriptions of new Lower Silurian lamellibranchiata, chiefly from 
Minnesota rocks, by E. O. Ulrich, who describes and figures twenty- 
seven new species, referred to the genera TeUinoniya, Technophorus, 
Cleidophorus, Modioiopsis, Orthodesma, Cypricardites, Matheria, Ischyro- 
donti', Whitella, Canenmya, and a new genus named Plethocardid. 
The principal Miasissippian section. By Charles R. Keyes. Bulletin, 
G. S. A., vol. iii, pp. 288-300, with one plate; June 3, 1892. The term 
Mississippian is used, in accordance with the suggestions of Profs. 
Alexander Winchell and H. S. Williams, as a substitute for "Lower Car- 
boniferous;" and the section here described in considerable detail, with 
careful correlations of the strata exposed at many localities, is seen in 
the bluffs of the Mississippi river from Burlington, Iowa, to Cape 
Girardeau, Missouri. The whole Mississippian series, as there observed, is 
divided into four groups, named in ascending order the Kinderhook, 
Osage, St. Louis, and Kaskaskia groups, which in turn comprise 
together fourteen recognized formations. 
LIST OF EEOENT PUBLICATIONS. 
Papers in Scientific Journals. 
The School of Mines Quarterly, Vol. XIII, No. 1, Nov. 1891, contains: 
The Filling of Mineral Veins, by J. F. Kemp. 
- The National Geographic Magazine, Vol. IV, contains: Studies of 
Muir Glacier, Alaska, by H. F. Reid. 
The Canadian Record of Science, Vol. V, No. 1, contains: Additional 
Notes on Devonian Plants from Scotland, by D. P. Penhallow; On the 
Cherts and Dolomites of the Rocks of Thunder Bay, Lake Superior, by 
E. D. Ingall; Vol. V, No 2, contains: Descriptions of some new S|)ecies 
of Fossils from the Caml)ro-Silurian Rocks of Quebec, by H. M. Ami; 
The Physical Features of the Environs of Kingston, Ont., and their Hist- 
ory, by A. T. Drummond; Some Laurentian Rocks of the Thousand 
Islands, by Dr.- A. P. Coleman; The Nickel Deposits of Scandinavia, by 
J. H. L. Vogt. 
