Botany. : 643 
on each crystal are R, 2R, and the trapezohedron 2P}, When the 
4 
tetartohedral plane is on the right edge of an upper rhombohe- 
dral face the crystal is dextro-rotatory. The jeffersonite of 
Franklin, as been investigated crystallographically and 
chemically by Kloos, of Stuttgart." Inthe prismatic zone only 
10 * œ and æ P were found. The crystals were terminated by oP, 
+P, 2P 3, and 3P3. The pleochroism is strong a = honey-yel- 
low, b = yellow-green, c= blue-green. Absorption ¢ > a. Sections 
parallel to the clino-pinacoid gave an extinction of 17° 15’ against 
the vertical axis. Specific gravity 3.352. A chemical analysis 
yielded: 
es, AL,0,. A O Fe, FO W0 cee 
39-59 1.76 11.20 0.13 5-97 11.31 3.07 0.53 
MgO CaO Na,O K,O H,O total 
8.42 12.85 3.31 1.95 1.02 IOI.11 
In the light of this. result the author does not feel justified in 
assigning to this’ mineral any definite constitution. The small 
amount of MnO would seem to indicate that the mineral under 
Investigation is not a true jeffersonite. Brauns? has discovered 
Brilon, Westphalia, and Neu-Sinka, in Sieben- 
found and examined by the same investigator. 
BOTANY.‘ 
FIGURES oF SOME AMERICAN CONIFERS.—Dr. M. T. Masters 
read a paper entitled “ Contributions to the history of certain 
eed of Conifers” before the Linnean Society, in January of 
dis, Present year, in which some American species are critically 
cussed. They are as follows, viz: 
bies amabitis Forbes. This is accompanied with a nearly full-sized figure of the 
7 a photo-engraving ofa terih tedadi. with half a dozen enlarged figures of 
es faves, leaf-sections, bracts, scales and seeds. 
“grandis Lindley, A large double plate showing five cones, with figures show- 
lon p etails of leaf and cone structure, illustrate this species. The variety 
(= Picea lowiana Gordon, Picea parsonsiana Barron, Abies lowiana 
is described and figured. A second variety, pa//ida, is doubtfully sep- 
thi Its leaves are ‘* of unequal length, flat, and pale in color.” 
concolor Lindley. Figures of the cone, foliage, leaf-structure, bracts and 
4 e this species. % 
McNab ) 
arated, 
ngelm. Full illustrations accompany the description of this 
ie $ 7 
a peues Jahrb. für Min., etc., 1886, 1, p. 211. 
3 b., P. 252. 
‘ Ear P. 250. ; 
E ted by Professor Cartes E. Bessey, Lincoln, Nebraska. 
+ 
