C117} 
The correction for the thermal expansion of glass may be neglected 
on account of the small deviation of the temperature from 20° C. 
For the calculation of the product of the specific volume and the 
pressure in atmospheres at 45° northern latitude the following table 
is obtained. 
August 25th TABLE IY. 
a ee Pressure | Specific | 
Time Ee 2 Ve 
| Atm. 45° NL. | volume a re 
| | 
2.40 
2.48 39.386 0.030944 1.09498 
3.005 
3.09 35.368 0.030958 1.09492 
3.20° 
3.28 35.346 0.030973 1.09485 
3.40 
3.48 39.327 0.030989 1. 09476 
4.00 
4.07 35.307 0.031008 1.0948? 
4.19 
4.265 35.286 0.031024 1.09475 
4.385 
Mean 39.337 0.030983 BEE bose | 4 1.0948* 
§ 4. Results. In the manner described above I have calculated 
every time the mean value for one pressure i.e. from 4—8 atm. 
for every atmosphere, from 8—16 for every 2 atm., from 16—32 
for every 4 atm. and from 32—64 atm. for every 8 atm. The 
values of PV for 4-8 atm. are not given here because when the 
apparatus was taken to pieces it appeared that the reservoir of 
tube ZA had burst, so that the determination of the normal volume 
was valueless. 
8 
Proceedings Royal Acad. Amsterdam. Vol. IV. 
