"404 Scientific Intelligence. [May, 
Or of Anhydrous sulphate of lime ........ 85°877 
Hydrous sulphate of lime .......... 13°400 
Carbonate’of ‘lime’ 20.5. 22 0. wee OrL98 
Oxide of On ee pote ite 0°254 
Reilica See ee ee ae JF RO. Sa 0? O23 
Bitumen ...... aed SSPE MS 0040 
COMTMIOM SAI eas vo cles ot a aus meine woey ek race 
100°000 
XV. Indurated Carbonate of Magnesia. 
This variety of native magnesia, as the species has been impro- 
perly named, was first observed by Haussmann at Baumgarten, in 
Silesia. It was at first taken for lithomarge. Its properties are as 
follows :— 
The colour of the fresh fracture is snow-white. Pieces that have 
been expesed to the weather have a yellowish-white colour, passing 
into ochre-yellow. Fracture, fine granular, uneven; here and there 
passing into splintery, and even. Fragments indeterminate, and 
sharp edged. Lustre, dull. Does not acquire any lustre, though 
scratched with the nail. Scarcely translucent on the edges. Very 
difficultly frangible, and difficult to reduce to powder. Scratches 
fluor spar and glass, and gives weak sparks with steel. Does not 
adhere to the tongue. Specific gravity 2:95. 
According to the analysis of Stromeyer, it is composed of 
WEAMOGSIA 66 ot vam orn icie' horn 2 te 2 e's a pt) p ODE 
CArHONiG DOIG, vp ao s.s:50 sso nes 58100 Lone 
Oxide of manganese...... Ee a Bway ib Wp yb 
WHAEED ve wales spore Re pane Waa wrele Cente, ty enone 
100-0000 
This analysis would make the weight of an atom of magnesia 
2°581, which is a little higher than the weight resulting from Ber- 
zelius’s analysis of sulphate of magnesia. 
ArtTicLte XII. / 
New Patents. 
WitiiamM Apamson, St. George’s, Hanover-square, London ; 
for a principle by which a horizontal wheel may be so moved about 
its axis by water as to give it a power considerably greater than can 
be obtained by the application of water to a wheel in any other 
position. -Dec. 22, 1815. 
Wicxiam Purnty, Newbury, Berks, iron-founder ; fora plough 
or agricultural implement, made on an improved principle, answer- 
