300 Scientifie Intelligence. 
“On page 92 of the same paper, metamorphism is spoken of as 
sometimes pseudomorphism on a broad scale’”— fe 
places it in ony with my knowledge of my own scientific 
opinions and the statements in my various mineralogical and geo- 
logical writings from the first to the last. 
2. On Triarthrus Beckii, supposed to have been found in a 
boulder in the Connecticut Valley; by W. W. Dones. ‘ (Letter 
to J. D. Dana, dated Oct. 22, 1873.)—Having seen last evening, 
in the October number of the American Journal of Science, the 
statement of your views there presented as to the age of th 
“Taconic” rocks, I communicate the following circumstance for 
what it is worth. 
[ saw recently in a friend’s collection a cast labelled “ Zriarthrus 
ley.” e collector of the cabinet in which I 
rous a 
Western Massachusetts, I am inclined to think the cast is from 
specimen owned by some friend 
and if really found in the Connecticut Valley, probably an er- 
ratic. 
From what I have observed as to the distance at which boulders 
are usually found from the place where the rock was én situ, the 
Forms and Origin of the Lead and Zine Deposits of 
western Missouri; by ApotF ScHMIDT i 
South- 
(Trans. St. Louis A 
ead. 
dolomite show that part at least of it was deposited in the rock 
“while the latter was in a magmatic condition.” 
In another kind of deposits called “ openings,” the ores panes! 
spaces which extend from a chert bed downward, but not beaten 
the limestone layer; they show no evidence of origin about hi 
te fissures, but rather from horizontal openings below a ¢?® 
