396 



Dr. W.W.J. Kicol on the 

 Table IV. (see also fig. 6) . 





«. 



0. 



a 



2Na01 



30-86 



0-2703 



1140 



4 „ 



35-70 



0-2061 



1730 



6 „ 



39-80 



01522 



261-5 



8 „ 



4222 



01185 



356-0 



10 „ 



4336 



01050 



4130 



KOI 



26-04 



0-3288 



79-2 



3 „ 



3083 



0-2598 



118-6 



5 „ 



33-31 



0-2157 



154-5 



7 „ 



36-12 



01624 



222-6 



2NaN0 3 ... 



35-64 



0-2660 



134 



4 „ ... 



39-99 



0-2554 



157-5 



6 „ 



47-87 



0-1740 



275-0 



8 „ ... 



50-96 



0-1470 



339-6 



10 „ 



53-00 



0-1219 



434-7 



12 „ ... 



54-08 



0-1075 



503-2 



KN0 3 ... 



29-49 



0-3057 



96-5 



3 „ ... 



37-61 



0-2389 



157-5 



5 „ 



42-38 



01939 



221-0 



as the constant a for water is less than that for any of the 

 solutions, it is evident that at low temperatures the amount 

 of expansion of salt-solutions is greater than that of water, 

 and that at some temperature the volume-difference between 

 a salt-solution and water reaches a maximum ; that is, at that 

 point the rate of expansion of both is the same. In order to 

 ascertain what temperature this is for the various salts, and 

 how far it is dependent on the strength of the solutions, I 

 calculated the .volumes of the solutions at every 5° between 

 20° and 100° C, and compared them with those of water. 

 How far I was justified in doing so is open to question ; still 

 the close agreement of the experimental and calculated num- 

 bers seem to warrant extrapolation to this extent without 

 there being much risk of introducing serious errors. In any 

 case this affects only NaN0 3 and the most dilute solution of 

 KN0 3 . The volumes for water are calculated from the 

 figures given by Volkmann* and Rosettif as the means of 

 the results obtained by previous experimenters. Plate VI. 

 contains the differences between the volumes of the various 

 salt-solutions at various temperatures. The result of this 

 comparison was that the maximum differences lay between 

 55°-60° for all solutions of NaCl ; at or about 50° for all KC1 

 solutions; while 2NaN0 3 , 4NaN0 3 , and KN0 3 give no 



* Wied. Ann. xiv. 

 t Pogg. Ann. Erg. 



>. 260 (1881). 



3d. v. p. 268 (1871). 



