IS. 
ina section#. 
receive aff 
ire strength 
i of bloomjj; 
pus biflorui 
get strongf, 
jht glass on 
hs, if suchf 
i frequently '1 
able to get 7 
found very jh 
r differenceJ| 
own in thq 
neral deca, 
^0/ 
pecies Selw^nite, described by him, is not a homogeneous mineral, 
eoplp examination shows it to consist off a felsite-like 
2S5 
forythe most part into serpentine; the garnet into minerals off/the 
chlwite group; while the hornblende has generally withstood 
alteration. The paper of Mr. Lemberg contains a considerable 
number of analyses showing the composition of the original min¬ 
erals, as well as of the products of decomposition.—( Zeimchrift d. 
DeutscJi\geol. Gesellschaft , 1875, 531.) / e. s. d. 
15 . Sehoynite, Noumeite, Garnierite .—Mr. G. II. A?. Ulrich, 
in a letter^ated Melbourne, Nov. 3d, 1875, states $riat the new 
T , 
A microscope 
base, throughWhich hydrous chromic oxide is disseminated, with 
\ occasionally a Wall octahedron of chromite. A similar method 
of examination has shown that the new nickel Minerals (noumeite, 
garnierite), descMbed by Professor Liversidge, are not homoge¬ 
neous. There is ftere a soapstone-like base, Composed of hydrous 
silicate of magnesiaythrough which either hydrous oxide of nickel, 
or hydrous silicate of nickel is densely distributed in small veins 
and roundish patches f Some of the Ore gave an assay up to 
twenty per cent of nickel, and others a/low as two per cent. 
16. Manual of Geology of J\D. Dana. —The following changes and corrections 
(besides some others merely typographical) have been made' in the stereotype 
plates of the work since its first piiblication m 1874, and are needed by the copies 
of the earlier issues. \ 
Page xv, 17 1. from top, P. C. Ckrpenter for J. G. Cooper. Page 3, 8 1. fr. top, 
1-1,200,000 for 1-200,000. P. 82, fig./lf has been inverted; and the same on p. 
546. P. 147, 41. fr. foot, C. for P. P/l 66, under fig., 4a Trenton for “ 4 Trenton.” 
P. 338, 2 1. fr. top, fig. 521, for “pj#21.” P. 344, in map, 9, 9, 9, for “8,” “ 8,” 
“ 8,” and 8 for “ 9.” P. 345, 18 1/fr. top, east for “ west.” P. 419, 4 1. fr. foot, 
,, southeast for “ southwest.” P./427, 31. and 4 1. fr. top, over two for “three or 
four.” P. 538, paragraph begipfiing with “ The absence” has been changed so as 
to make it state that between the meridian of 100° in Dakota and the eastern 
boundary of Oregon and California the mean annual precipitation is not, with 
small exceptions about th^higher mountains, over 16 inches. P. 675, 15 1. and 
14 1. fr foot, former for “latter,” and latter for “ former.” P. 699, 16 1. fr. foot,, 
yards for “feet.” P. 741, 18 1. fr. top, along tjie strike for “transverse to the 
1, strike;” and for the casing part of the paragraph has been substituted:—an 
| effect due to compression by the pressure to which the rocks had been subjected 
\ and a consequent expanding in a transverse direction. P. 756. To the first para¬ 
graph has been afided the remark [a suggestion tcNthe author by Prof. Terrill] 
that the retaining/bf the warm Gulf Stream waters in the Atlantic would give the 
ocean a higher/temperature than it now has, and thkt this higher temperature 
would be the occasion of an unusual amount of evaporation, and, therefore, of an 
extraordinaryamount of precipitation and frequency of storms along the cold 
borders of Jche continent in the Glacial latitudes; so that tjie theory adopted for 
the origin/of the cold of the Glacial period accounts for both the cold and the 
* abundant precipitation. P. 589, Cetacean area removed from Cretaceous column. 
III. Botan^ 
1. Notes on Agave / by Geo. Engelmann;, M.D.—This is a 
modest title of a paper in the TransacS^^of the Academy of 
Science of St. Louis, Missouri, vol. iii, December, 1875. Sepa¬ 
rately issued it forms a pamphlet of 35 pages, 8vo. If we mis¬ 
take not it begins that volume; so that the pages of the pamphlet 
mm 
01 23456 7 89 10 Missouri 
BOTANICAL 
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