On the formation of Ice. 179 
Analysis. 
Galena, when pure, has the proportion of eighty-five 
and fifteen sulphur; but five particular specimens ne 
following more e complex results : ; 
Lead 54 69 68 64 63 
Sulphur 8 
Sarbanes of lime and silex 88 15 16 18 19 
: 96 100 100 1 94 
Pyrites are frequent in lead ores, and sometimes antimo- 
ny, copper, gold, and silver. 
Arr. XXV.  Decessiadiiied Protea he foimation 
of Ice on still waters, and with the conta action eo 
cold upon the fluid beneath —Epiror. 
New- Haven, Jax. 12, 1821. 
Tue recent cold weather, which, with an uniformity n 
common in this maritime cer n, has Pere with little § in- 
parent, entirely free from intermixture of spongy portion 
and resembles, very much, fine masses, of rock erystal, 
with a ase cerulean tinge. 
* This is not mentioned as the extreme cold of this climate, but only as 
the extreme eee observed by us, this winter; this occurred at eleven 
P. M. on the 10th in We have the mercury in Fabrenheit’s thermome- 
ter, occasionally does here to 10° and 12° below 
P.S. Jan. 20. Since the above note was written ua stebaamanas 
here (j Just by _— sun-rising o on the 19th) indicated 12° below 0. ‘In the in- 
terior it b r, and in Maine, as the — sig Bree 
it pes biee: 359 ghersr tha proximating to the congelation of 
uicksilver. At Norwich, Conn. it has been 26° below 0. ; 
25. Yesterday the thermome from 
o'clock, and was then about 0, an i 
day, although the sun shone bri: several times this winter, t th 
of eld has been merece how afer su rising. — ‘morning, at 
rn 2° belowe- GES g at eleven last Wesley, 
ine ‘the morning 1 16°, and even, 
fas of | 
iewinter thas far, is 
Brea average of the Topi chook Suen 
fous 
been. whose average. 
o'clock PM M. before: the mereury rose to os and at 30 ‘clock it was 2° above. 
