( 590 ) 



TABLE XXV. 



The values of 7',/,. derived from different diagrams and belonging 

 to different coinciding isotliermals, did not differ more than 0.5 deg. 



We obtain for C, 



— for the mixtures O.i and 0.2 re- 



T.p.rk^'xk 



spectively : 3.435 and 3.446, in sufticient harmony with the value 

 3.45, derived on p. 577 of this Comm. IV for carbon dioxide. 



About the critical data the following may be remarked : v^i: shows 

 a maximum in the range investigated; for x between 0.1 and 0.2 

 p_rk descends much slower than between and 0.1 ; the same holds 

 in a less degi-ee for Txk- 



§ 7. To calculate the quantities introduced in Comm. No. 75, (Proc. 

 Dec. 1901): 



1 



dT,-k 

 1^ 



;.? ^ 



.1=0 



J^ fdp,k 



etc. 



I have represented several quantities of Table XXV as functions of -r. 

 Observations for more values of .v would be required to detei'mine 

 with some certainty how say v^t depends on .r. As it appeared 

 tliat in consideration of the critical volume of oxygen, the data of 

 table XXV, could not be satisfactorily represented by a quadia- 

 tic function, I have added a term with x^ and have derived the 

 coefficients from the data for carbon dioxide and oxygen (putting 

 herefor C^ equal to the value for carbon dioxide) and the two 

 mixtures. In this way I found: 



Trk — T],\l — 0.G563 X + 0.8350 ,c^ — 0.6715 ,r*]. 



p^j, —jji, |1 — 1.0871 X + 4.1885 ,e — 3.4063 x'\. 



v,.]c = vie |l + 0.5422^ X — 4.0310 x' + 3.2183^^■='|. 



T,^j — Tk |1 — 0.25792 x — 0.2349 x'\. 



p^^l —pk |l + 1.6639 X -I- 1.5775 x^ — 3.5462 .r'^j. 



T,., —Tk\l~ 0.2474 X + 0.0898 .v^ — 0.3352 x"^]. 



2->,,. =pk \\ + 1.4953 ./■ — 1.9113./;^ -f 0.1112 o^\. 



