461 



For this it is liowever required that either 



6,8, or 



dm' \(ikyk 



^A-r) =—6,5. (Cf. These Proc. of 3 Sept. 19J3, p. 56 and 57). 



It is now certainly interesting to consider iiovv tiiis will be for a 

 substance as Argon, where yj^ is not 0,9, but 0,75. 



For tiie calculation of the vahies of ƒ I had to make use of 

 Rankine— Bose's interpolation formula drawn up by Crommelin and 

 treated already above [^ 18). This gives, indeed, the much too low 

 value 5,628 instead of 6 for ƒ/,.. but as also the following values of 

 ƒ will possibly be too small in the same degree, there is a chance 

 that the value of the ratio (ƒ — 1) : (/!• — 1) will not differ too 

 much from reality. We then find the following table. 



It is certainly remarkable that it would follow from the found 



values of (f that here too ( ^ | would be about — 7, just as for 



\omJk 



ordinary substances as Fluorbenzene e.g. (see above). For I -— = 



yomjk 



= --^^ = — 6,63 (whereas it is — 6,8 for CgH^Fl. But on this 



0,0181 ^ 



head little can be said with certainty, as we have too few observations 



in the immediate neighbourhood of Tk at our disposal. 



The limiting value for m = 0,6 is now, however, much lower, 



namely about 1,23 against 1,41 for ordinary substances. Now for 



