292 Dr. Blagden’s Experiments on 
fuch effect would have taken place. I have funk a thermo- 
meter with it and fnow to *f\ ; which, according to the pro- 
portions in the table, would make more than three parts of 
the fait to two of water. Accordingly, a large quantity of 
the f\lt was required to the fnow. 
No particular phenomenon was obferved with this fait, except 
the lingular configuration of its ice, which affumed the form 
of fungi, or of fome kinds of lichen, with feathered ftrie. 
•The folutions were difficult to cool much below their freezing 
point. 
Of the falts with a metallic bafs, green vitriol affords one 
of the mod tranfparent folutions in water. It finks the ther- 
mometer nearly to 27°! with fnow, and reduced the freezing 
point of,. water according to the following table. 
. ♦ * 
Green vitriol. 
Proportion 
Freezing 
Freezing 
of water to 
point by the 
point by 
the fait. 
experiment. 
calculation. 
10 : 1 
O 
3°i 
O 
3 l 
6 : 1 
3°i 
. 3°i 
4 • 1 
29 ! 
29! 
3 : 1 
281 
281 
2,4 : 1 
28 
28 
The third column is calculated 
from the laft experiment, in 
which the freezing point of a 
folution of one part of the green 
vitriol in 2,4 of water proved 
to be 28k 
The ice formed by thefe folutions affumed a foliaceous confi- 
guration, with a texture of penniform ffriae, in fome refpedts 
like the appearance exhibited by a drop evaporating under a 
microfcope, as delineated by Baker. Scarcely any fait gave 
the point of congelation fo regularly in the proportion of the 
quantities mixed with the water, and none afforded folutions 
4 which 
