216 
Scientific Intellig ence. — Chemistry. 
11. Precast's Journey to England. — Prevost, a good zoologist 
and excellent geognostical observer, visits England this summer, 
in order to study the transition and secondary formations ; 
then goes to Normandy, with the view of comparing the rocks 
of that country with those of England ; and the results of this in- 
vestigation will be published at Paris next winter. Desnoyers, 
an active and skilful observer, will join Prevost in Normandy. 
12. Supposed Salt Formation above Shell-Limestone. — In 
Karsteffs Archives, there is a paper by Oeynhausen, on salt de- 
posites, in which he endeavours to shew, according to Hausman, 
that there is a deposite of variegated and gypseous marls, analo- 
gous to the variegated sandstone above the shell-limestone. This, 
however, we are informed by Dr Boue, is an error ; for these 
marls belong to the Quader Sandstone . 
13. Boue s Arrangement of Tertiary Rocks : 
First Arenaceous deposite. 
First Tertiary Limestone. 
Second Arenaceous deposite. 
Second Tertiary Limestone. 
Fresh-water Limestone. 
Plastic Clay and Lignite. 
Calcaire grossier, and Lignite. 
Gypsum, Marl, Sand. 
Limestone. 
Calcaire d’eau douce. 
CHEMISTRY. 
14. Discovery of Selenium in the Volcanic Rocks of Lipari, 
. — Dr Turner has just sent to us the following interesting no- 
tice, the substance of which was communicated to him by Pro- 
fessor Stromeyer . — 66 Professor Stromeyer has lately discover- 
ed Selenium under two different forms, one of which is al- 
together new. On diluting some fuming sulphuric acid, such 
as is made at Nordhausen from the sulphate of iron, he ob- 
served that a solid matter separated from the diluted acid, 
which, on examination, proved to be selenium. One pound of 
the acid gave, on dilution, about a grain of selenium. This sub- 
stance has already been detected in some of the Bohemian sul- 
phuric acid ; and it is supposed that the acid in question had 
been prepared in Bohemia. The second source of selenium is 
in the volcanic productions of the Lipari Isles, among which 
Professor Stromeyer has lately discovered a native sulphuret of 
selenium. He has mentioned neither the mineralogical charac- 
ter of the new mineral, nor given an account of his chemical ex- 
