68 
Proceedings of Royal Society of Edinburgh. 
to me three years ago by M. Amagat. These data were given to four 
decimal places 
only. 
0° 
C. 
20° 
•2 C. 
Pressure. 
Amagat. 
Formula, 
Amagat. 
Formula. 
1 
1-0000 
1-0000 
1-0320 
1-0320 
501 
•9468 
•9498 
•9673 
•9722 
1001 
•9130 
•9156 
- -9294 
•9311 
1501 
•8884 
•8885 
•9018 
•9018 
2001 
•8684 
•8684 
•8805 
•8797 
2501 
•8522 
•8524 
•8630 
•8624 
3001 : 
•8394 
•8395 
•8484 
•8484 
The agreement is not by any means so complete as in the case of 
water : — but it is probable that slight changes in the values of the 
constants may greatly improve it where defective, while otherwise 
scarcely interfering with it. 
The formulge for average compressibility employed were, respec- 
tively 
•2863 
2350 -\-p 
for 0°, 
and 
•3016 
2086-1-^9 
for 20° -2. 
(Note that calculation from the data, direct,' gives 0^31126 as the 
value of A in the second of these, but this has to be divided by the 
volume at one atmosphere.) Here, according to the previous mode 
of interpretation, the Laplace-pressure is diminished, and the ulti- 
mate volume seems to be increased by rise of temperature, as was 
to be expected. 
