Dr Anderson’s Account of new Mineral Species. 147 
natural and pleasing effect of the pictures; but it may be so 
far counteracted where necessary, as sometimes in night-scenes 
or snow views, by interposing tissue-paper or other appropriate 
material, tinted blue. 
The effect produced depends in a great measure on the 
management of the light, and a few experiments will soon 
enable any one to regulate its admission so as to exhibit every 
change of effect. 
I have been induced, by the representations of friends, to 
bring this Portable Diorama under the notice of the Royal 
Scottish Society of Arts; and I have no doubt that the ex- 
periments of others may lead to many improvements in its 
construction. G. Tair. 
EpinpureH, lst November 1841. 
Analyses of new Mineral Species. Communicated by Dr 
Tuomas Anverson of Leith.* 
Aphrodite—A mineral found at Taberg and Sala, and long 
supposed to be Meerschaum, has, on analysis, been found to 
be Serpentine. A mineral, however, of the same sort, from 
Langbanshyttan, and which is identical in external characters, 
is found to have a different composition, and has been called 
Aphrodite, whose composition is 
Silicie acid, - , : 51.55 
Ox. manganese, 2 - 1.62 
Protox. iron, : 5 0.59 
Magnesia, . ° - - 83.72 
Alumina, ; A E 0.20 
Water, : gietive 4 - 12.82 
100.00 
This is therefore the third bi-silicate of magnesia which oc- 
curs ; the other two being Picrosmine and Picrophylle. 
Berzelite.—Under this name Kuhn has described a mineral 
from Langbanshyttan, of an impure dirty white or honey-yel- 
* The above communication was sent from Stockholm by Dr T. Anderson, 
who is at present studying there under Berzelius. 
