Mineralogy and Geology. 265 
It contained subordinate prisms as is usual with these large specimens, 
nd it was seamed transversely here and there with a feldspathic layer. 
e other crystal, No. 2, which was near the former, had also 
30 
he dimensions of both are 
given in the figures in inches on a 
scale of one foot to half an inch, 
and their cubical contents and 
weight are as follows. 3 
Area of the base of the prism, 
fig. 1, = 521 square inches = 3°68 
he area of the base of the beryl, fig. 2, is 928 square inches = 
6-44 square feet. Taking the specific’ gravity of beryl as before, we 
have 2675 ounces X 6:44 = 17227 oa = 1076 pounds as the 
Weight of one foot in length of the crystal. : 
: On Stigmaria, (Proc: Bost. Soc. Nat. Hist., in Boston Traveller 
of Jan. 7, 1852.)—Mr. J. E. Tescnemacner exhibited a specimen of 
anthracite coal containing a flattened branch of Stigmaria one foot in 
length, and three inches in diameter, with the usual markings of cica- 
thought could only be dispelled by instituting close comparisons, and 
this he proposed to do between what was already known on the subject, 
the fossil specimens on the table, and our well known tree, Picea ball 
ens: 
st. The cicatrix of the leaf as shown in the perfect specimens on 
the coal, when examined with a good Coddington lens, agrees riot 
with those of Picea, except in size: the fossil being 4th, the recent ay 
of an inch in diameter,—the cicatrices of Picea are persistent even on 
ood. 
e form of the leaf of Stigmaria, as given in figures in _ 
various publications, is linear with an obtuse termination, @ midrib; ms 
thickness at the edges produced by involution of the margin :—sueh is 
the leaf of Picea. ; aes a. sci 
Szconp Szntes, Vol. XIII, No. 38—Mar 
2.1. . 
OF Wits 
- oe ae P 
ere Morrie | 
