Mineralogy and Geology. 117 
his two eyes near two apertures, sei he sees the united images, as 
it were, behind the optical apparatu 
In the stereoscope which I have had made by Messrs. Elliott 
Brothers the observer stands at a short distance from the appa- 
ratus, and looks with both eyes at a large lens, and the image ap- 
me as a ei object close to a4 eh ns. 
bo 
> 
™m 
te 
= 
=] 
“OQ 
a 
= 
oO 
fe) 
fas) 
Be 
mt 
et 
oy 
lar] 
28 
Qu 
=" 
co 
Lar) 
pe 
= 
2 
ian 
a) 
ic) 
°o 
=} 
ee 
S 
~ 
Le =, 
_ 
So 
ie io) 
co 
4 
The united 
images pos See a real object in the air close ia the large lens. 
imag may be magnified or diminished at pleasure, by sliding 
the piece aie A ae the two lenses hg Pie fe or farther from the 
picture.— The Laboratory, i, 408, Sept. 67. 
We regret to announce that this seh little journal is com- 
pelled to suspend publication, for want of sufficient support. 
the twenty-sixth number which completes the first volume, the ed- 
itor, Mr. Join ¢ Cargill Brough, after stating the above facts, and 
alluding o the high scientific character of its original articles (in 
— we 6 date concur), hints that the Laboratory my reappear 
h 
II, MINERALOGY AND GEOLOGY. 
Extract from a paper on Borates and other Minerals in An- 
wi and Gypsum of Nova Scotia ; by Prof. How, Windsor, 
8.*—Silicoborocalcite, a new mineral.—The mineral exhibits 
i 
ameter; they sometimes show when detached, a sub-vitreous luster 
in the exterior, = mineral is translucent in thin fragments, its 
er is seen under the microscope to be transparent and crystal- _ 
; the form is possibly rhombic. The greatest hardness isabout 
8°55 specific gravity, 2°55. Before the Blongipe. etd fragments 
| * The paper is to appear in the L. E. & D. Phil. Mag. 
