454 



value /> 5,933 follows from the values given in Oomm. 120'» 



(see p. 10) '}. 



We had even sufficient reasons (see § 17) to fix the value of 

 ƒ at 6 (/' could be still somewhat larger then). 



Rankine-Bosk's interpolation formula (sec These Proc. of Nov. J 913, 

 or Com in. 138), namely 



h c [d 

 log p=za + y, + ^ + -^ » 



gives by differentiation : 

 dp 

 JdT 



= 2,d(- 



hence 



,__Tdp _2,3 

 '^~'pdT~~Y 



2c M 



h 

 T 



2c 



1 



d^ 



634,891 — 



61538,18 3229392" 



T ' T' 



But this formula, which is calculated from all the observations 

 of p (so also from those below — 140°,80), and corresponds pretty 

 well with it, gives the value fk =^ 5,628, which is much too low, 

 at Ti (150,65), hence still lower than the value ƒ/, = 5,712, given 

 at the conclusion of Comm. 115, and calculated with h z= — 524,3169, 

 c=i 4- 11343,28, r/ = 0. 



In virtue of this I think I have to recommend caution in the 

 use of the values of p, at least in the neighbourhood of the critical 

 temperature. 



We sliall now give the following survey of the values found for 

 the densities q, and q. (Comm. 131j, and also the corresponding 

 values of p (Comm. 115, and These Proc. of Nov. 1913 or Comm. 138). 



p=A2A51 (for- 1250.49) 

 35.846 ( » - 129°. 83) 

 29.264 ( * —134°. 72) 

 22.185 ( ^ —140°. 80) 

 13.707 ( » — 150°. 57) 

 7.4332 ( » —161°. 23) 



1.3369(» -183°. 01) 



We luwe calculated from q^ and o.^ the values of d^ and (/, 

 given in the following tables by means of Qk = 0,53078. 



1) Slightly below Th, at - 125°,49, /"= 2,577X2,3026 = 5,933 was namely found. 



