180 T. S. Hunt on Norite Rock. 
itself—and that in no very considerable degree—while the per- 
centage of awards relative to the number of exhibitors was 
double the corresponding percentage for England and her col- 
onies. 
No extracts which our space would allow could do justice to 
the report, especially if not accompanied by the cuts or engrav- 
ings; and if we were to instance and enlarge upon passages 
and descriptions that appear specially important, it would con- 
vey no conceptions to the reader comparable with what he will 
obtain by a reference to the work itself. We only add, in 
justice to the distinguished author, that, while he is thoroughly 
American in a due anxiety to set forward the claims of his 
countrymen, it is with an obvious impartiality toward all the 
competitors, and with a diligence whose regulating principle is 
truth and an endeavor for the benefit of mankind in general. 
Art. XXIT—On Norite or Labradorite Rock; by T. STERRY 
Hont, LL.D., F.R.S. 
[Read before the American Association for the Advancement of Science, at Salem, 
August, 1869.] 
THE various rocks composed essentially of a triclinic or anor 
thic feldspar, with an admixture of hornblende, pyroxene, 
hypersthene or diallage, have by lithologists been designated by 
to norite. The name of hypersthene rock or h rsthenite 
(sometimes contracted into hyperite), was given b MaeCulloch® 
to a i 
rock feldspar, and 
glare found by him in the Western Islands of Scotland, 
and su 
this rock in place showed that though hypersthene, generally 
in very small proportion, is a frequent element, it is often 
__ ® MacCullloch, Geology of the Western Islands, i, 385-390. 
