m 
Sckn tific Intelligence. 
Temp. 
Pressure in 
Temp. 
Pressure in 
Reaumur. 
Atmospheres. 
Reaumur. 
Atmospheres. 
80® 
5.6 
180 
68-8 
100 
10.6 
200 
86.3 
120 
18.0 
240 
119.4 
Into vapour, at 150 
, 37.5 
260 
, 130.9 
When the volume of ether was and the tube 20, he ob- 
tained the following results. 
Temp. 
Id. 
Temp. 
Id. 
Reaumur. 
Atmospheres. 
Reatimur. 
Atmospheres. 
100® 
. 14.0 
160 
50.5 
120 
22.5 
180 
63.5 
130 
28.5 
200 
. 70.5 
140 
35.0 
230 
81.0 
Into vapour at 150 
42.0 
260 
94.0 
III 
. NATURAL 
HISTORY. 
MINERALOGY. 
S8. Characters of Amher. — 1. Amber has never the lengthen- 
ed or drop-form of the gum animi, or other substances with 
which it may be confounded. 2. Amber has always a richer colour 
than the resins, &c., which are comparatively watery, thin, and 
feeble in colour. 3. It has a peculiar lustre, indicating a higher 
refractive power than resins, &c. ^ 4. Amber, on rubbing, gives 
out a dilferent smell from the resins, with which it might be con- 
founded. 5. Both resins and amber are electric. 6. If the spe- 
cimen is held against a red-hot iron, the smell of the smoke will 
distinguish it from the resins or gum animi, gum opal, &c. 7, 
Hauy’^ Drop Character is not good. 
29. Rose on Felspar.^ Alhite^ Labradorite.^ and Anorthite. — M, 
Gustavus Bose of Berlin, has published a highly interesting and 
elaborate paper, in the Annalen der Phys'ik^ &c, of Gilbert, for 
February 1823, on the substances formerly comprised under the 
name of Felspar, which he divides into four species, viz. Felspar, 
Albite, Labradorite, and Anorthite, differing from each other 
in their form, and in several other characters, as also by the re- 
sults of their chemical analysis. 
Amber has a lower refractive power than several of the gums.-— Ed. 
