1293 



licuce if at the critical 



a 



point the mean A becomes somewhat smaller, but of the same order 

 of magnitude as n, then />,-.- - p will become of the same order of 

 uKignitude as >/ for a gradient of velocil}- ^/= 1, and must, there- 

 fore, certainly, be taken into account. On the strength of this we 

 should have to expect that an abnormally great value of ?; would 

 be found at tiie critical density, when for 7';^ we examined the 

 value i\ as function of the density. Warburg and Von Babo ') have 

 determined ?; for CO^ at 32,6° for different densities. i. increases wil li 

 the density. There does not ap[)ear any irregular increase at the 

 critical density from their observations. It would be interesting when 

 similar observations could be made at a temperature nearer Tj.. 



1) Wtedemann'.s Annalen. XVll p. 390. 1882. 



84 

 Proceedings Royal Acad. Amsterdam. Vol. XXI. 



