1()S FREEZING OP ALCOHOL, 



• 



to 10® ; the part of the stem below 00° measured nearly 18 

 of these spaces. A mark wa? made at every space, till, ok 

 arriving at the end of the 17th, the graduation could not be 

 carried farther. This point, of course, corresponded to -f Qq-> 

 — 1/0°= — lJOdeg. of Fahrenheit's scale. 

 was exposed to This thermometer was exposed to the cold produced by 



the cold by the method alluded to, and after some time was examined, 

 th«s method, * 



and the alcohol when the alcohol was found' to have passed all the marks, 

 partly frozen. an( j was obviously sunk within the ball of the thermometer. 

 A slight degree of discoloration was observable. The ther- 

 mometer was replaced, and examined about five minutes after- 

 wards, when the ball of the thermometer was found broken, 

 and crystals adhered to the fragments. 

 Other portions I next took a glass tube, about 3-10ths of an inch in dia- 

 of the alcohol me ter, and sealed at one end j into this I poured alcohol till 

 frozen in a ^ stood in the tube 4-10ths of an inch deep, and then exposed 

 tube * it to the cold, produced as before j after some time it was so 



completely solid, that on inverting the tube it did not drop, and 

 only a very minute stream was perceived to glide slowly down 

 the inside of the tube j when this stream had reached nearly 

 the middle of the tube, the whole suddenly fell out, and, pitch- 

 ing in a glass, was broken into several pieces, which quickly 

 melted. 



This experiment was several times repeated, but by allow- 

 ing the alcohol to remain a little longer exposed to the cold, 

 it became so completely solid, that on inverting the tube, not 

 the least portion of fluid could be perceived to separate* from 

 the mass. 



In order to be as certain as possible of the strength of the 

 alcohol I employed, I again took its specific gravity, and the 

 result corresponded with what I before obtained. 



These experiments, therefore,. left me no room to doubt that 

 I had frozen alcohol, which, at the temperature of 62°, is of 

 the specific gravity 798. 

 Repetitions of Being appointed to deliver the course of lectures on che- 

 the experi- mistry for the session 1810-11, I had no leisure, at that time., 

 ment " to pursue these experiments. They were resumed, however, 



in the autumn of 1811. The second experiment was repealed 

 and varied, and solid masses of alcohol of some magnitude ob- 

 tained. 



