174 Mr F. Clissold’s successf ul Ascent of Mont Blanc. 
No. 1. Is the fragment of a rock in situ , nearest the sum- 
mit, that is, the highest point of Europe. It is an amorphous 
rock, in which feldspar predominates, mixed with a little quartz. 
It is yellow here and there with oxide of iron. 
No. 2. Is a specimen of those rocks with vitreous bubbles on 
the surface, which are commonly found on the Aiguille of 
Goute, and of which Mr Clissold has brought a great number 
from the summit of Mont Blanc. The one in question is com- 
posed of a mass of black amphibole (hornblende), almost pure, 
to which adheres a distinct crystal of feldspar. At the place 
where the two substances come in contact, are seen three or four 
globules of black glass, one of which is about a line and a half 
in diameter, and from this runs a slight groove, excavated out 
of the feldspar portion of the stone, and in which there are 
small globules of black glass, an effect which seems to confirm 
the opinion of those who attribute these fusions to lightning *. 
No. 3. Is a small specimen of the same kind of rock, but in 
which the feldspar is more disseminated. Two faces of the 
stone are wholly covered with microscopic vitreous globules, 
and one of its two faces, seen with a microscope, appears en- 
tirely covered with a varnish arising from fusion. 
No. 4. Is a fragment of rock of the Grands Millets, covered 
with small crystals of Adularia, intermixed with Amianthus -J\ 
Aiit. XXVI .— the Visible Solar and Lunar Eclipses which 
will happen in the year 1823, as calculated for Edinburgh. 
By Mr George InnesJ. 
In calculating the two lunar eclipses, I have increased the 
moon’s equatorial parallax ^th part, for the refraction of the 
* In our next Number we shall give an account of similar appearances obser- 
ved on the summits of heaths on the Pyrenees, Riesengeberge and Andes. — E d. 
•j* Mr Clissold, we understand, means to deposP the greater part of the speci- 
mens in the British Museum, and in that of the Geological Society.— Ed- 
£ The times are inserted according to the Civil account, the day being reckon- 
ed to begin at midnight. The elements are calculated from the Tables of M. De- 
lambre and M. Burckhardt. 
