324 American Geologist. ^^^y, 1905 
WINCHELU ALEXANDER N. 
Minnesota's Eastern, Southern, and Western Boundaries. (Minn. 
Hist. Soc. Coll., Vol. X, 1905.) 
WOODBRIDGE, DWIGHT E. 
The Mesabi Iron Ore Range, VIII, IX, X. (Eng. Min. Jour., Vol. 
78, March and April, 1905.) 
WRIGHT, G. FREDERICK 
Professor Shimek's Criticism of the Aqueous Origin of Loess, 
v(,l. 35, pp. 236-240, April, 1905.) 
CORRESPONDENCE. 
Correction. On page 29 of my paper "On the Apical End of the 
Siphuncle in some Canadian Endoceratidae," etc., in the American Ge- 
ologist for January last, it is inadvertently stated that the genus (Ra- 
phistoma) is "not known to occur in rocks as old as the Calciferous; 
and "that the limestone at Kingston Mills is not older than the Chazy 
formation." 
The first of these statements should read, — the genus is not known 
to occur in rocks older than the Calciferous; and the second — that the 
limestone at Kingston Mills is probably not older than the Calciferous 
formation. J. F. Whiteaves. 
Ottawa, April 25, 1905. 
PERSONAL AND SCIENTIFIC NEWS. 
Dr. Geo. D. Lauderback, of San Francisco, expects to 
work the coming summer on the geology of the Mount Diablo 
region east of San Francisco bay. 
William G. Mather, president of the Cleveland-Clififs 
Iron Company, delivered the Class Day Address May 5th at 
the Michigan College of Mines, Houghton. 
Dr. Ralph Arnold, of the U. S. Geological Survey, will 
spend the summer in investigations under the direction of Dr. 
Wm. H. Dall in the Tertiary of the Santa Monica mountains 
and the southern Mount Diablo range. California. 
Minnesota Academy of Sciences. At the 274th meeting 
oh May 9th Mr. Warren Upham presented a paper entitled, 
