bid 
a ee 5.0? Seas eel ‘ 
Proposition Ist, in relation to the relative time of greatest de- 
pression of temperature before different meteors. Ry 
The greatest daily depression or decrement of. temperature takes 
place between one and two days previous to the aurora borealis, 
auroral clouds and halos.* 
Proposition 2d. Relative order of the thermometric sie baro- 
metric changes before different meteors. 
Previous to the clouds and halos, the temperature changes cither 
_ earlier than the pressure or nearly at the same time ; previous to 
the aurora, ca pentose Aenea lite day Shee 
fore the tem 
Proposition 3d. Length of time before the storm when its in- 
dications appear in case of different meteors. 
When the snow or rain is preceded by an aurora aecedan or by 
luminous columns, the thermometer begins to fall and the ba- 
rometer to rise between three and five days before the storm; and 
when the storm is preceded by auroral clouds or halos the same 
indications are ete! between three and three and a half doyn 
before ite 
- Proposition 4th. Teunittien of pressure before rain or anew hot 
preceded by these meteors. 
Previous to a thunder shower, or arain or snow not iaesecded 
by an aurora borealis, a halo, or auroral clouds or luminous col- 
- umns, the increase of atmospheric pressure for several successive 
days i is less general, but when it does occur, it commences either 
* = or later than when the storm is reeaded by either of those 
t 
eors ; more generally between fixe and a half and six nc 
before au shower or storm. > 
Proposition 5th. Time from iifferent shiteors:taxmematreain: 
The snow or rain descends sooner after a halo than after an 
auroral cirrus cloud, earlier after this than after a vertical lunar 
column, and earlier’ after a lunar column than after an aurora bo- 
realis. 
Proposition 6th. Theoretical inference in relation to the nature 
o these meteors. 
one These pre itions now stand nearly as they were corrected’ in the list of 
errata in many Nos. 
t L use the term storm from the want of a better one equally brief, to “signify 
the descent of rain, snow, OF 
