216 The Ainci'tcan (reologi.st. >iiir.ii, ikos 
Prof. Wright's statement also conveys tlie idea that throughout the 
entire \vidtli of the glaciated district moraines which lie nearest the 
glacial boundary are necessarily contemporaneous. Prof. Chamberlin 
long since called attention to the fact that the moraine which lies 
near the glacial boundary in eastern Ohio departs from the boundarj' 
in south central Ohio, and that in regions farther west there are 
other moraines lying outside this moraine. It has been his effort 
through his own investigations and those of his associates to trace out 
carefully the entire system of moraines and determine what their 
exact correlations may be. I'recise correlations are yet to be shown 
but the facts at command make it necessary to dissent strongly froirr 
Prof. Wright's view. In Ohio the outer moraine of the southwestern 
portion of the state is not the outer moraine of the eastern and cen- 
tral portions, it being lost to view beneath the later moraine above 
referred to before reaching the Scioto valley. In Indiana and Illinois 
still greater shifting and overriding took |)lace, a later group of 
moraines crossing an earlier group at high angles. This later group 
may prove to be the correlative of the outer belt of moraines in east- 
ern Ohio and western Pennsylvania but upon this point final judg- 
ment cannot be rendered until the moraines are given further study. 
Enough has perhai»s been said to make it evident that the complexity 
of the drift deposits and the difficulties of correlation are far greater 
than Prof. AVright has represented. Frank Leverktt. 
4lOii Oraiid BoulcranJ, Chica/fo, III.. Fch. i;, ISU.l. 
The Illinois St.\te Mtseum. 1 beg to thank you for your courteous 
comment on the work of the Illinois State INfuseum in the last issue 
of the American Geologist. 
In justice to several prominent scientists, who have gratuitously 
rendered important services to the Museum by revising our collec- 
tions of Illinois fossils to be exhibited at the Columbian F^xposition, 
I wish to add to the names mentioned in your article, the following, 
viz.: Prof. James Hall, who has revised all our brachiopods ; Mr. 
Charles AVachsmuth, the crinoids , Dr. (". Pominger, the corals ; Mr. 
David White, the Coal Measure plants ; 3[r. J. M. Clarke, the trilo- 
bites ; Dr. Ch. E. Beecher, the Ceratiocarid;e ; Dr. C. A. White, the 
Cretaceous and Tertiary mollusca ; Prof. E. D. Cope, the Tertiary 
fishes; Prof. IMilton Whitney is now preparing a report on mechanical 
analyses of a large series of soils of the state ; captain A. W. A'ogdes 
has prepared a bibliography of publications on the pala-ontology of 
Illinois, and Prof. J. M. Nickles, of Sparta, 111 , volunteered his last 
summer vacation in constructing a longitudinal section from P^ast St. 
Louis to Shawneetown, and collecting samples of all the strata out- 
cropping along this line. I hope to have still other names to add to 
this list before the opening of the Exposition. It would be but fair 
to add that a large share of the work has been ably done by Prof. .1. 
A. Udden of Augustana College, Kock Island. 111., and by Wm. F. 
Nicholson, both of whom have been emi)loyed by the Illinois lk)ard 
