•^44 Scmitific Intelligence, 
nute, and the water remained converted into ice. I made this 
experiment, for the first time, at Mittau, in an apartment, the 
temperature of which was 16° R. (72° Fahr.)” This method, 
now held out as an improvement on Leslie’s, our readers will 
observe, (See this Journal^ voL hi. p. 59.) is the identical pro- 
cess given by Edward Nairne, so early as 1777. 
28. Solution and Crystallization of Lime. — It has been some 
time ago observed by Mr Dalton, that lime was more soluble in 
cold than in warm water. He found, that one pint of water at 60°, 
takes up y of lime ; whereas, one pint, at 212°, takes up : 
and hence he concludes^ that water at the freezing point will 
dissolve nearly twice the quantity of lime, that water at the 
boiling point will do. In trying to ascertain the cause of this, 
Mr R. Phillips found, that the lime deposited by an increase of 
temperature, was in the state of crystalline particles ; that the 
action of the heat had caused the crystallization of the lime, and 
had affected it iti a much greater degree than could be account- 
ed for by the evaporation which occurred, more than one-half of 
the lime being crystallized by evaporating j^gth of the solution. 
Mr Phillips’ explanation of these interesting facts, though inge- 
nious, does not appear to us satisfactory. See Ann. of Phil. 
Feh. 1821. p. 107. 
29. Mercurial Atmosphey'e. — By suspending a piece of gold- 
leaf in the upper part of a bottle containing mercury, Mr Fara- 
day found that, in about the end of seven weeks, the gold was 
whitened. Hence he justly concludes, that mercury is always 
surrounded with an atmosphere of the same substance. Quar- 
terly Journal, vol. x.'-p. 355. 
30. Bicarbonate qf Ammonia. — Mr R. Phillips has found the 
bi-carbonate of ammonia to consist of 
S atoms Carbonic Acid, 
55.08 
55.5 
1 of Ammonia, 
21.50 
21.7 
2 of Water, 
22.64 
22.8 
99.22 
100.0 
See Ann. of Phil. Feh. 1821, p. 111. 
31. On the Alloys qf Platinum. — The following additional ex- 
periments on this subject have been communicated to us by Mr 
John Murray : 
