450 . Miscellaneous Intelligence. 
rent and without smell. It contained always a small wedinan. of ore 
ganic matter, and tasted ener side iuipet ng the teeth ; 
as found by Mr. Erni, 100482 °C. 1000 pts. of the. water E 
yielded— 
ait Erni: Craw. 
; 8 35706 é & Sega 
- Fe 02065 =. : : ‘2258 
ae Al 01111 0966 
Oa 0°4557 4596 
Mg 01562 1805 |, 
K 00571 
Na 00522 0412 
Me me setae 0148 
+ AAEM dae ake Seach 0220 
Si 0 5 h : 0684 
_ Chlorine and organic Mintbers, “Wale traces : ; eas 
“46750 46848 
position of 1000 pts. of wat 
2 
8 20122 20070 
FeS 04856 4266 
AlSs 03702 : 3232 
8 11065 11161 
8 * 04592 ‘5805 
kK 1061 0822 
NaS 01196 094 
Ma Olt ae. Ve 0363 
0:0656 0684 
_. Chlorine, organic matter, trace | 
Yale Laboratory, April 18, 1850. 
7. On the Cause of Aurore Boreales ; by Avcuste DE LA 
being an extract from a letter to M. Pep ult, (Comptes Rendus, Oc 
1849; Phil. Mag., xxxv, Dec., 1849.)—I have just read, in a mi 
Mr Motlet.oo the Aaron oreales, inserted-in the Annales de 
et de Physique, 3d series, vol xxvii, the following passage :— 
_ With regard to the origin of this luminous matter (that 
aurora borealis), it seems s natural to attribute it to the electric flu 
tained in the atmosphere, and which at great heights where 
rarefied, must become luminous as under the receiver of the air- 
and in the barometric vacuum : this hypothesis would acquire a 
probability if we succeeded in proving by direct experiments, that 
—— — an influence on electric light.’ 
comma the emy of Stanek an papa which 
Thad advanced of the aurora borealis , the influence ex 
pantie magnetism upon the light which is produced i in ordinary elec- 
ee 
. 
