398 Scientific Intelligence. 
altered and crystalline condition, have hitherto pr resented insuper- 
able difficulties in the way of unravelling the geological structure 
of this eastern region 
It is to be hoped. that the government of the New Dominion will 
make liberal eaten for the distribution of this valuable map. 
Meanwhile, a geo logical map, on the same scale and plan, of the 
southeastern United States is ’ ereatly needed to supplement this 
admirable publication of the Geological Survey of Canada, and 
we vaya tei a hand to prepare and means to publish it will not 
be Ayia 
ie add rite Rocks at Marblehead ; by T. Sterry Hunt.— 
The following note, appended to my paper on ee Rocks in the 
last number of this Journal, was accidentally omitted. In speak- 
ing of the boulders of labradorite rocks at Marblehead Neck, I 
said “specimens of this rock, correctly determined and labelled, 
are found in the collection of the Essex Institute at Salem. To 
. Loring, Prof. Packard and Prof. Kerr, I visited the 
locality at Marblehead Neck and collected further specimens of 
e characteristic cone rock.” 
age March 18, 1870. 
6. Expl pees in the Rocky Mountains by J. D. Whitney.— 
Professor J. D. Wurrnzy has given the California Academy of 
Sciences some of the results of sfolarheidas under his direction in 
the Booky Schick during the summer vacation of 1869 
versity, an 0 
Yale Scientifie School, and Mr. C. F. San adipyewte 
A careful triangulation was made of the dominating range of the 
- Rocky Mountains between Gray’s Peak and the south edge of the 
South Park, and a map dra cae Punk Hoffmann, on a scale of two 
mates to an inch, embracing an area of about 3 ,500 square re miles. 
ece le : 
is hoped that it will be possible to extend the topographical work 
to the north and west, so that a detailed map nan Al se Ms of 
the whole of the highest ortion of the Rocky Mow 
a ong the results obtained by this pete wae the de- 
aS _temination of the elevation of some high points not prions 
_ The highes ge gh ere ge ye oe est of the 
vhich dt 14,145 feet in elevation; Mount 
14128 fects ‘and Mount Yale, 14,078 feet. Many other 
ey 
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