270 Scientific Intelligence. 
dron, but also on the — oe - density of the vapor to that 
of its liquid. If the vapor were light, and the liquid heavy, 
other things being equal, the slendjurticls would be smaller than 
if the vapor were heavy and the liquid light. There would evi- 
case of toluol may be taken as representative of a great number 
of others . The specific gravity of this pee is 0°85, that of water 
aqueous vapor bei ow, as the size es the clow-patil 
is directly proportional to the specitic vapor, 
and inversely pro —— to ate specific ais of the liquid, an 
easy calculation prove t, assuming the size of th r 
t, " aqueous vaper is without a Sarre in these particulars ; 
it is aa only the lightest of all va the common accepta- 
tion of that term, but the lightest if “all Boe ee except hydrogen 
and ammonia. To this circumstance the oe beauty of 
the clouds of our atmosphere is mainly to be ser 
The sphericity of the cloud-particles may be beamadlistoly infer- 
red from their deportment under the luminous beams. The light 
which they shed wh hertcal is continuous: but clouds may 
also be precipitated in solid flakes; and then the incessant spark- 
ling of the cloud shows that its particles are plates, and not 
spheres. Some ae of the same cloud may be composed of 
Il, GEOLOGY. 
ee ioe ae Well at Terre Haute, Ind.; in a letter from Prot. 
A. Guyor to J. D. Dawa.—I have received, phicuah the kindness 
of ~~ she Morrison of Terre Haute, tami the following 
very in teresting record of the borin, of an esian Well at that 
place, made under the direction and at the eaiegaies of Chauncey 
Rose, Esq. This gentleman reel the thanks of the gece 
for having carried the = hike to that extent of minuteness wit 
special view to be useful to science. The knowledge of the stan 
and succession of stra: strata down to the depth where the geologist 
some ea whisk would enable the geolo ist to establish the 
place of each stratum in the e regular series of formations. But I 
