and a remarkable Structure in Analcime. S59 
this case the isinglass retains a fixed doubly refracting structure^ 
related to the axis of compression or dilatation ; and if it were 
cut into pentahedrons, similar to those of the analcime, we might 
combine them together, so as to imitate, at least in the direction 
of one of the axes, the phenomena exhibited by the mineral. 
The property which has now been described becomes an in- 
fallible and easily applied mineralogical character for Analcime, 
However shapeless be the fragment, and however much obliter- 
ated be its external faces, its action upon polarised light will in- 
stantly determine whether or not it belongs to this species. 
Haiiy first observed in Analcime the singular circumstance of 
its yielding no electricity by friction, and he even derived its 
specific name from its want of this property. If we consider that 
the crystal is a combination of solids of variable density, and 
separating from one another by numerous intersecting planes or 
nodes, where the variations of density change their direction, we 
ma}^ ascribe to this cause the difficulty with which friction de- 
composes the natural quantity of electricity which resides in the 
mineral. 
Art. XI. — Journal of a Tour to the Coast of the Adriatic Sea, 
and to the Mountains of Carniola, Carinthia, Tyrol, Saltz- 
hurg, and Bohemia, undertaken chiefly with a view to the 
Botany and Entomology qf those countries. By Dr David 
Henry Hoppe and Dr Frederick Hornschuch. (Con- 
cluded from p. 91.) 
“We gathered besides, to-day, plants of Euphorbia dulcis, 
Lamium Orvala, Orchis pallens, AEcidium Anemonis ; and, on 
the hills of Monte Spaccato, in our return, we got a rare Scor- 
zonera with narrow and broad leaves, which is probably Clu- 
Scorzonerapannonica,ydiV. lat folia et angust folia. There 
grew also, in large quantities, an unknown and very beautiful 
Senecio, with undivided leaves and a single stalk. 
“ The Emperor went to-day to the cave of Cornial, where our 
host waited on him, as king of the grotto. Our astonishment 
was excited by a couple of large stalactites, which he brought 
from thence with him. They are ^ feet loiig, of a yellowish 
