( 1018 ) 
substance for successive values of /oy 4» were now read off, and 
the values thus obtained were then graphed as functions of log t, 
arranged according to log 2. By reading from the graphs thus 
deduced, the deviations for the various substances were brought to 
the same reduced temperature. For these reduced temperatures were 
chosen the temperatures of the argon isotherms, viz. 
1.00816, for argon corresponding to —121°.21 C. 
1.01460, „ te ., 5 = 120° 24 
LOZ. fe Se … —119°.20 
1 MIDI + De a … —116°.62 
1.04368; 5. nf a „ —115°.86 
1 Baap. ;, ae - » —113°.80 
10833 + A „ —109°.88 
1432201, ns Ps „ —102°.51 
And finally, the deviations were graphed as functions of log dv, 
and all reduced to the same temperatures. This diagram is repro- 
dueed on the Plate accompanying this Communication. The deviation 
curves for the reduced temperatures 1.01460 and 4.04368 could not 
be drawn on it, as in order to do this distinetly the seale would 
have to be made too great. The rectangle on the right hand lower 
portion of the diagram borders the immediate neighbourhood of the 
eritieal state. It is best, while employing this method of critically 
examining the deviations, to leave this region out of account pro- 
visionally, as otherwise one would have to allow for the influence 
of the disturbance function '). A description of the information afforded 
by this plate coneerning the deviations of the various substances 
seems to us unnecessary; it speaks for itself, and gives clear ex- 
pression to the systematic deviations of argon from the other sub- 
stances in this region. ; 
$ 9. Caleulation of certain data which ave of importance in. the 
discussion of deviations from the law of corresponding states. 
To get an idea of deviations from the law of corresponding states, 
certain data are usnally caleulated, and we are now able to obtain 
their values for argon from our former experiments. °) 
3) Proc. Febr. 1908. Comm. No, 104. 
*) Proc. May 1910, Comm. No. 115; Proc. Dec. 1910, Comm. No. 118@; Proc. 
Dec. 1910, Comm, No. 1185. 
