390 Intelligence and Miscellanies. 
three hundred and twenty + elec about nine and a 
half ae avoirdupois,— 
. Observations on the evaporation of ice, by M. Schueb- 
ey a results from these observations that the evaporation 
of ice is much more considerable than is generally imagin- 
ed, and that under certain circumstances, it may surpass 
that of water. Ina dry cold air on the 9th of January, the 
evaporation from ice in twenty four hours, was twice as great 
as from an equal surface of water in ne middle of February, 
during mild and cloudy weather. may perceive from 
this the manner in which snow ae gradually by long 
exposure to a cold atmosphere.—ZJbid, 
43. Swiftness of Sound.—At the temperature of melting 
ice, the experiments 0 
Parry and Foster give 333.15 metres 
Moll and Van Beck 332.05 
Stampfer and Myrbach 333.25 
Arago, Matthieu, and Biot 331.05 
Benzenberg 333.70 
Mean, 332.64 
Idem. 
44. On the colored flame of Alcohol, by Prof. Vogel of Mu- 
ich.—After mentioning the experiments of Brewster, Pal- 
lot; Herschell, Blackadder, &c., the Prileodir entertained 
the assembly with the yellow, red, and green flames of Alco- 
hol. The yellow was produced by kindling alcohol on salts 
with bases of ammonia, soda, —— iron, mercury, 
platina, gold, nickel, cobalt, and bismu A red flame was 
obtained from salts with bases of _ strontian, lithia or 
magnesia. On the salts of copper, or alumine, 
the flame is green. The salts should ‘all =] soluble in alco- 
hol. A green flame is also produced in burning the solution 
of boracie acid and alcohol, or from weak hydrochloric 
ether. The oxid of copper, according to M. Vogel, is: re- 
duced, by burning alcohol, into protoxide and metallic cop- 
— the i flame itself containing copper.—Ferrusac's 
Nov. 1 
AS. Bleciciy of the Tourmaline—We have announced 
that, according to M. Becqueret, the fragments of the tour- 
