478 Scientific Intelligence. . [JuNE, 
ay 
aa 
A y= ese ee eeeneesesreeresesresreeseee — € —s 1 
ie Hee ae, ee) 
At y= go —2¢&* Se rior el ( ie — 1) 
ie ae aa wy cays 
AS yi eS Cty SS = Sale ae 
dy dy 
mT Tt w ae ae ee, (“— 
A*y=e 2 é + 7 = 
ay : dy 
— (n—2)wW —— ay 
lig ==)! A Oe ae ery ew o- fie —_ i)" 
which is the general formula given by Lagrange. 
XI. Sale of Minerals. 
We understand that the fine collection of minerals which be- 
longed to the late Rev. Richard: Hennah, of St. Austell, in Corn- 
wall, will be sold by Mr. King early in June next. 
XII. New Arrangement of Primitive Rocks. 
Raumer, a German geologist of considerable eminence, has just 
published a small tract on the Granite of the Riesengebirge. ‘The 
following is the succession of rocks which he describes as occurring 
in that country :— 
1. Central Granite.—It is not intermixed with the adjacent 
rocks, and does not send out veins from its mass into the rocks that 
yest upon it, 
2. Gneiss and Granite Formation.—This formation rests imme- 
diately on the central granite, and the gneiss and granite alternate 
with and pass into each other. 
3. Green-slate.—This formation is principally composed of horn- 
blende, and rests sometimes on No. 2, sometimes on No. 1. 
4. Gneiss.—It rests upon the gneiss-and-granite formation, or 
the green-slate, and subordinate to it is a bed of mica-slate. 
5. Mica-slate.—It contains great beds of lime-stone. 
6. Clay-slate. 
It deserves particular attention that all these five different forma- 
tions are wrapped round the central granite in what is called a 
mantle-form position. 
XIII. Ordnance Maps of British Counties. 
The circumstances which were thought to render expedient the 
suspension of the publication of the Ordnance Maps being now 
removed, the publication of them is resumed, and they may be 
obtained, as formerly, at the Drawing-room in the Tower, or of 
Mr. Faden, Charing Cross. As the suspension was only intended 
to be temporary, not merely the operations of the trigonometrical 
survey, but those of the mapping and engraving, have been regu- 
larly carried on during that period, under the superintendance of 
