994 Generat Notes. | October, 
upon reéxamination, proves to be also hornblende. The writer 
proposes to call this type of rock, composed essentially of olivine 
and hornblende, “hudsonite,” on account of its being so well 
developed at Stony point, on the Hudson river. [The name 
“hudsonite” was applied, as early as 1842, by Beck to a variety 
of augite occurring near Cornwall, on the Hudson river. It 
would therefore seem preferable, if a new name is considered 
necessary, to employ some other than that proposed by Cohen. 
The present writer has elsewhere suggested “ cortlandtite” as 
appropriate, since this rock is such a typical member of Professor 
Dana’s “ Cortlandt Series.” —G. H. W.|——-Dr. K. Oebbeke,’ of 
Munich, communicates some observations made by him on a 
specimen of andesite from the summit of Mt. Tacoma, Washing- 
ton Territory. The question of the existence of pleochroic 
augite is again discussed and regarded as undecided in spite of 
the work of Cross, Hague and Iddings on the western hyper- 
sthene-andesites. If the matter is still in doubt it must be con- 
fessed that Oebbeke here furnishes but little convincing evidence 
in favor of a pleochroic monoclinic pyroxene. M. Ver- 
beek’ makes some interesting remarks on the recent ‘lavas re the 
East Indian archipelago. These are, for the most part, hyper- 
sthene-andesites, or, as this writer prefers to call them on account 
of the ‘presence of both hypersthene and augite, “ pyroxene- 
andesites.” The hypersthene is almost always in excess of the 
augite. Pure augite andesites have not been observed, but such as 
contain only hypersthene rarely occur. The complementary roles 
played by the hypersthene and olivine in these rocks was noticed _ 
by Verbeek independently of Hague and Iddings, who discovered 
and described the same in their notes on the hypersthene ande- 
site and basalt of the Western U. S. in 1883, Mr. G. P. Mer- 
rill? of the U. S. National Museum, has published some notes on 
the hornblende andesite from the new volcano on Bogosloff 
island, in Behring sea. They are quite normal in appearance, 
containing lath-shaped plagioclase crystals, brown hornblende and 
reen augite imbedded ina microlitic base. Two varieties are 
RY tee one light colored with fifty-six per cent of silica 
and the other muth darker with fifty-one and a half per cent. 
BOTANY. 
BoranicAL WORK OF THE AMERICAN ASSOCIATION FOR THE 
ADVANCEMENT OF SciENcE.—The Ann Arbor meeting of the 
association, just closed, proved of more than usual interest to 
: ere was a notable increase in the permanent 
: of the papers. They were much more thoughtful, as a rule, oa 
i Nen es Jahrbuch für Min., de, 1885, I, p. 222. 
ee eet Min, a c., 1885, I, P 243. 
of the U. S. iatan al Museum, Vol. vill, 1885, Ep 3t; 
; CHARLES E, , Lincoln, Neb 
