390 Intelligence and Miscellanies. 



three hundred and twenty kilogrammes, about nine and a 

 half pounds avoirdupois. — Idem. 



42. Observations on the evaporation of ice, by M. Schueb- 

 ler. — It 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. In a 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 the middle of February, 

 during mild and cloudy weather. We may perceive trom 

 this the manner in which snow disappears gradually by long 

 exposure to a cold atmosphere. — Ibid, 



43. Swiftness of Sound. — At the temperature of melting 

 ice, the experiments of 



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- 

 nich. — After mentioning the experiments of Brewster, Pal- 

 lot, Herschell, Blackadder, &c., the Professor 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, manganese, iron, mercury, 

 platina, gold, nickel, cobalt, and bismuth. A red flame was 

 obtained from salts with bases of lime, strontian, lithia or 

 magnesia. On the salts of copper, uranium, or alumine, 

 the flame is green. The salts should all be soluble in alco- 

 hol. A green flame is also produoed in burning the solution 

 of boracic acid and alcohol, or from weak hydrochloric 

 ether. The oxid of copper, accordhig to M. Vogel, is re- 

 duced, by burning alcohol, into protoxide and metallic cop- 

 per, the green flame itself containing copper. — Ferrusac's 

 Bidl. Mv. 1828. 



45. Electricity of the Tourmaline. — We have announced 

 that, according to M. Becqueret, the fragments of the tour- 



