118 The American Geologmi February, it>96 
The various fields of work and objects of special exploration by each 
party are briefly stated, as are also the several researches in paleonl 
ology, chemistry, and hydrography. A summary of the mineral indue 
tries, with tables giving the quantities and values of their products in 
1894, l>y Dr. David T. Day, occupies eleven pages. 
The topographic surveys during the fiscal year covered 7,000 square 
miles in the Atlantic section, completing seventeen atlas sheets. Iu 
the Central section an aggregate area of 10,475 square miles has been 
surveyed, completing ten sheets. In the Rocky Mountain section, 
5,963 square miles were surveyed, completing eight sheets. Lastly, in 
the Pacific section the area surveyed this year was 6,975 square miles, 
completing fifteen sheets. The largest area surveyed in any State was 
in Nebraska, 4,750 square miles: and the total area was 30,395 square 
miles. About three-fourths of the whole are mapped on the scale of 
1:125,000, or about two miles to an inch ; and the other fourth is on the 
scale of 1:62,500, or very slightly less than a mile to an inch. During 
the field season 120 men were employed in this department, and an 
average of 65 during the winter. Up to the end of last June, about 
900 topographic atlas sheets had been engraved. 
Fourteen folios of the geologic atlas of the United States were ready 
for distribution and sale (at 25 cents a folio, with one exception) June 
30, 1895: and six others were in press. The uniform scale of two miles 
to an inch, except in special cases, is adopted for the entire geologic- 
atlas, including large districts which were surveyed and topographically 
mapped on the scale of a mile to the inch. w. u. 
The Preglacial Valleys of the Mississippi and its Tributaries. By 
Frank Leverftt. (Jour, of Geol., vol. :i, pp. 740-763, Oct. Nov., 1805.1 
In this paper Mr. Leverett has sought to bring together such data as 
are available on the subject of preglacial drainage lines in the northern 
part of the Mississippi basin. He traces the line of the great river 
south from its junction with the Minnesota, pointing out the places 
where its pre- and post-glacial channels do not coincide. In like man- 
ner the courses of the Rock river, the Wabash and the Ohio are follow 
ed. The help of borings is brought in to show the great depth of the 
rock bottom of some of these preglacial valleys. The question of a 
preglacial southward outlet from lake Michigan is discussed, but left 
undetermined for want of sufficient data. The date of the uplift which 
led to this dee]) erosion in preglacial time is considered to be post- 
Cretaceous, e. \v. C. 
On the Correlation of New York Moraines with the Raised Beaches 
of Lake Erie. By Frank Leverett. (Am. Jour. Sci., 3, vol. 50, pp. 
1-20, July, 1895.) This paper is a continuation of a previous discussion 
(op. cit., April. 1892) of the same subject. Mr. Leverett continues his 
study of the connection between the raised beaches at the western end 
of lake Erie with the several moraines at its eastern end. He thus con- 
nects the "Sheridan" and the "Crittenden" beaches with two well 
marked moraines into which he thinks thev graduate. E. w. c. 
