452 



EEPORT 1886. 



tion of a much greater amount of heat than the solution of the same 

 quantity of the soHd in a relatively small mass of water. 



In like manner it is observed that the addition of water or of salt to 

 a solution already formed occasions contraction, but the amount of this 



Fig. 2. 



contraction constantly diminishes with each successive dose of water or 

 of solid salt. This has just been shown for the water. The following 

 table, taken from Nicol's paper (' Phil. Mag.,' June 1884),^ shows the effect 

 of adding salt in successive molecules. The column headed A shows 

 that the molecular volume of each successive molecule is greater than 

 the preceding, the increase being from 17'08 up to 22*87 for the last 

 molecule. 



' The figures given in the table are the result of recent more accurate determina- 

 tiona, kindly communicated by the author. 



