392 The American Geologist. •^""^' ^'^'^^■ 
WEEKS, F. B. 
Tungsten ore in eastern Nevada. (U. S. G. S. Bull. No. 213, Ser. 
A, 1902, p. 103.) 
WHITEAVES, J. F. 
Description of a New Species of Matheria from the Trenton 
Limestone at Ottawa. (Ottawa Naturalist, vol. 17, Apr., 1903.) 
WINCHELL, H. V. 
Amorphous Precipitates. (Eng. and Min. Jour., Vol. 75, No. 18, 
May, 1903, p. 661.) 
WINCHELL, N. H. 
The Pleistocene Geology of the Concannon Farm near Lansing, 
Kan. (Am. Geol., Vol. 31, May, 1903, pp. 263-309.) 
WINCHELL, ALEXANDER N. 
Note on Titaniferous Pyroxene. (Am. Geol., Vol. 31, May, 1903, 
pp. 309-311.) 
WITHERSPOON, D. C. (and T. G. GERDINE). 
Explorations among the Wrangall Mountains in Alaska. (Nat. 
Geographic Mag., vol. 14, No. 4, April, 1903, p. 161.) 
WOLFF, J. E. 
Zinc and manganese deposits of Franklin Furnace, N. J. (U. S. 
G. S. Bull. No. 213, Ser. A, 1902, pp. 214-218.) 
WORTMAN, J. L. 
Studies of Eocene Mammalia in the Marsh Collections. (Ami 
Jour. Sci., Vol. 15, May, 1903, pp. 399-414.) 
CORRESPONDENCE. 
The Rock Name Anorthosyte. By professor Gushing made aware 
of his article in The American Geologist, March, igo2, where also my 
name is mentioned, I should like to explain my views in regard to the 
term anorthosyte. 
Gushing says, that the only objection urged against the name which 
has come under his notice and which seems to him to be valid, has 
been urged by me (Die Labradorfelse des westlichen Norwegens, I). 
I there argue that the name is equally applicable to an albite or oligo- 
clase rock, and that these are too acid to be grouped with rocks, which 
are properly regarded as end series of the gabbro family. As such rocks 
are of the rarest kind, I agree, that my objection has most theoretical 
interest, but it has nevertheless its value. 
In the Ekersund area, where I have examined the rocks exactly, I 
have described the special rocks under the names labradorite rocks and 
bytownite rocks, and it is still my opinion, that where the rocks have 
been exactly examined, it is best to apply these conciser names. In the 
Ekersund area most of the rocks were labradorite rocks, and therefore 
