A. P. Mathews 



TABLE I 



Comparison of "a" computed from the critical data, etc., 

 with "a" computed from the molecular weight and valence. The 

 figures represent dynes for gram mol amounts, multiplied by io~ 12 



From the equation a = C(Wt. X Val.) 2 / 8 , if M 2 K, or 

 "a," can be determined, and if C and the molecular weight 

 are known, the total number of valences in the molecule can be 

 calculated. If from this total number of valences there be 

 subtracted the number which is known to exist in the mole- 

 cule on the basis that hydrogen is univalent, oxygen bivalent, 

 carbon quadrivalent and so on, the remainder may be sup- 

 posed to constitute the average amount, or number, of extra 

 or residual valences which the molecule possesses. It is this 

 number which has been determined in this paper. 



