PHYSICAL CHARACTERS OF MIXTURES AND SOLUTIONS. 
341 
Table IX. 
Weight of water contained in piezometre at 4°C. 114-9727 grms. 
1 millim. of capillary gauge =0-000517173 cub. centim. 
Per cent, of 
Depression 
Temperature, 
Compressibility for 1 atmosphere. 
metbylic 
alcohol, 
by weight. 
of gauge, 
in degrees 
Difference. 
in millims. * 
Centigrade. 
Found. 
Calculated. 
0 
10-10 
16-8 
0-00004741 
10 
10 
9-29 
9'25 
16-2 
16-8 
•00004377 \ 
•00004359 / 
0 00005497 
-0-00001 129 
20 
20 
9-28 
9-29 
15- 9 
16- 2 
•00004372 1 
*00004359 / 
•00006303 
•00001938 j 
30 
30 
9-12 
9-07 
15-3 
15-6 
•00004300 1 
•00004278/ 
•00007052 
•00002763 
40 
10-19 
17-4 
•00004781 
•00007758 
•00002977 | 
50 
10-49 
16-5 
•00004916 
•00008420 
•00003504 
60 
11-88 
16-4 
•00005541 
•00009029 
•00003488 
70 
13-27 
15-7 
•00006167 
•00009586 
•00003419 
80 
16-05 
16-3 
•00007416 
•00010083 
•00002667 
90 
19'SO 
15-2 
•00009103 
•00010511 
•00001408 
100 
23-75 
15-0 
•00010879 
All relations pointed out in the former paper, as existing between the various pro- 
perties of mixtures, of ethylic alcohol and water, find their parallel in the mixtures now 
under consideration. Certain sets of properties come to a maximum deviation from the 
calculated mean at the same strength ; in some cases the values found are always below, 
in others always above the calculated mean ; and in both mixtures the rate of expansion 
shows the same singular peculiarity, viz. of being for certain mixtures below, for others 
above the mean. 
Undoubtedly all the various physical characters of mixtures must, to a certain extent, 
be dependent on each other, and no explanation of the relation existing between any 
two of them can be received which is not compatible with every other property observed. 
The relation existing between some of these characters seems, however, to be more inti- 
mate and direct than it is between others. Thus in this, as in the previous mixture, 
the specific heat and the heat evolved during mixture not only come to a maximum 
deviation from the mean in mixtures of the same strength, but all mixtures evolving 
the same amount of heat during their formation possess a specific heat elevated to the 
same amount above the mean ; and, moreover, the numerical relation between these two 
values is the same for mixtures of every degree of strength. Hence, if the heat evolved 
in the formation of 5 grms. of any of the mixtures be divided by 7*9, the elevation of the 
specific heat of this particular mixture above its calculated mean value is obtained. 
Between the boiling-point and the capillary attraction a somewhat similar relation is 
found. If in this case the observed depression of the capillarity of any mixture below 
its calculated mean value be divided by B9 (the capillarity of pure water taken as 100), 
* In the paper on Mixtures of Ethylic Alcohol and Water, previously quoted, the numbers in the corre- 
sponding column (column 2, Table XIII.) should he divided by four. 
9 , O 
o A 1 
