MISCELLANEA. 
197 
2nd. Silica . . 0*4334 
Alumina . 0*2463 
Ferric Acid . 0*1672 
Manganic Acid 0*0818 
Water . . 0*0566 
0*9853 
Oxygen. 
0*2251 
0-1150 
0*0380 
0*0183 
0*0503 
Proportion. 
4 
2 
}»• 
0563 
The small discs of Ottrelite are disseminated profulsely 
through all the transition strata of the above mentioned 
locality^ generally of the grey colour, but sometimes of a 
fine rose, in fine flakes equally distributed in layers between 
the laminations, and at other times completely filling the 
rock, so as to give the matrix the appearance of the mineral 
itself. 
New Acid of Sulphur. — At the sitting of the Academy of 
Sciences, on the 13th ultimo, M. Pelouse read a report of the 
discovery of a new acid of sulphur, recently made by Messrs. 
Fordos and Gelis. The experiments performed by these 
gentlemen have been repeated by the commission of the 
academy appointed to report upon the discovery, and the 
same results have been obtained, leaving no doubt, from the 
tests applied to them, of the existence of this acid in the com- 
pound indicated by them. The series of the oxygenated 
combinations of sulphur, to which sulphypo-sulphuric acid 
was added by M. Langlois, about two years ago, has received 
the addition of a new acid ; thus, consequently, making the 
number of its compounds six. 
Interesting Fossil, — Mr. Bensted has discovered a unique 
specimen in the Iguanodon Quarry. The fossil is of the 
order Testudinata, and is apparently a marine turtle. It has 
a circumference of nearly three feet, and some of the marginal 
and other plates may be seen in their proper position, but 
