254 Tfater saturated with Sea Salt 



The lolutions above No. 12 were more tardy In freezing. 



When the solution was at 1 6 degrees, the freezing did 

 not take place sooner than 40 or 50 minutes. 



In the solutions at 19 or 20 degrees, only some few icicles 

 are formed around the edges of the mixture. 



2. At a cold of twelve dc2;rees, no solution freezes in a 

 mass; all of ihem from 2 to 15 degrees are frozen upon the 

 sides of the phia!, and the layer of ice becomes more or less 

 thick, always in an inverse ratio to the degree of saturation. 

 The solutions at ig and iO degrees never froze at all. 



3. When the mixture of salt and ice is formed, and the 

 thermometer is down at — 1 7", we may keep up this degree of 

 cold for two hours at least, provided we slope the vessel so 

 as to let the water flow out prcxluced by the melting. 



If we draw out the phials containing the solutions at the 

 moment the thermometer begins to rise, we observe as fol- 

 lows : 



1. The solutions which are below 10 degrees, present 

 masses of ice only without any appearance of water, to such 

 a degree of cold that these masses when carefully pounded 

 do not, for some time, moisten the bodies upon which the 

 operation takes place. 



2. The solutions which mark from 10 to 16 degree?, pre- 

 sent a soft kind of ice, which may be bent, and is of the 

 consistence of sherbet. 



3. The solutions which mark 18 and 20 decrees, present 

 only some crystals of ice swimming in a limpid liquor, or 

 fixed upon the sides of the vessels. 



4. The thawing takes place more speedily in phials, when 

 the liquor is at a high degree of saturation, and more slowly 

 at the lower degrees, in such a manner that it follows vi- 

 gorously and constantly the scale of saturation. 



5. The icicles separated with care from the portion of 

 water not frozen, and washed with pure water, present the 

 following phajnomena : 



A. The water issuing from their melting is constantly 

 salt. 



B. The gravity of the water proceeding from the crystals" 

 of the solutions from 1 to 3 degrees, compared with that of 



the 



