of Edinburgh, Session 1884 - 85 . 
173 
The apparatus which I used in my experiments consisted of a 
wide glass tube of convenient length, with a narrower tube attached 
to one end, and the whole tube was accurately graduated, and 
contained 262 c.c. up to a convenient point in the small tube. If 
equal volumes are to be experimented upon, 131 c.c. of the denser 
liquid are poured into the tube, and on this an equal quantity of 
the lighter liquid is poured, which can be done without any 
apparent mixing. The tube is now placed in a cylinder of cold 
water, and the liquid brought exactly to the 262 c.c. mark. The 
tube is then taken out, and after inverting till no farther streakiness 
is observed, is again placed in the cylinder of water, and as soon 
as the temperature has become the same as at the beginning of 
the experiment, the alteration in volume is noted. 
The following are the results of experiments which I have made 
with solutions of some of the common salts saturated at 10° C., 
using equal volumes of the solutions and water : — 
Water with equal 
vol. of sat. sol. 
Parts of anhyd. salt 
dissolved by 100 parts 
Contraction when 
of following salts. 
of water at 10° C. 
KC1 
31-97* 
•325 per 
cent. 
k 2 so 4 
10*1 
•082 
kno 3 
20-77 
•144 
k 2 co 3 
88-72 
2-682 
>> 
bTaCl 
35-75 
•490 
Na 2 S0 4 
8-04 
•107 
>> 
NaN0 3 
84-3 
•975 
Ha 2 C0 3 
16-66 
•206 
NH 4 C1 
36-6 
•273 
jj 
(nh 4 ) 2 so 4 
1-302 
>> 
nh 4 no 3 
185* 
•772 
>> 
CaCl 2 
63-3 
1-135 
>> 
BaCl 2 
33-3 
•235 
>) 
MgS0 4 
30-5 
•677 
>> 
ZnS0 4 
48-36 
•835 
>) 
TeS0 4 
19-9 
•327 
A1 2 K 2 4S0 4 
4-99 
•033 
» 
CuS0 4 
20-92 
•218 
a 
Pb21ST0 3 
48-3 
•228 
55 
It will be observed that there is contraction in every case ; in 
* The results in this column are from Storer’s Dictionary of Solubilities , 
and are chiefly from the experiments of Gay-Lussac and Poggiale. 
