804 Mr. T. Carlton Sutton on the 



the experimental data which is to be preferred. For the 



same reason, a form involving e * e alone could not be 

 distinguished from either of the others by means of the 

 experimental data now obtainable. 



That each of these is close to the truth is shown by the 

 fact that they satisfy the Van 't Hoff * criterion (obtained 

 by an independent thermodynamical process) 



do 10g n[Q 1 ]"'~2^' 



where g is the gramme molecular heat of reaction at tempe- 

 rature 0; and they agree exactly with Arrhenius' adaptation 

 of this condition, namely, 



n[P,] x > » 



my= ae ■ 



[It should be noted that there is no mathematical guarantee 

 that these are the only mechanisms that will satisfy the con- 

 dition of Part I. This will be discussed at length in an 

 attempt that is being made to determine, from the available 

 experimental results, the shape of (f)(6).] 



Part III. 

 Case of Unimolecular Actions. 



In Part II. of this paper certain results have been inter- 

 preted in the cases of actions other than unimolecular actions. 

 The case in which Ai = l, A. 2 = A 3 = ^4 = &c. = is the said 

 case of a unimolecular action, and the argument of Part I. 

 will be seen to apply step by step in precisely the same way 

 as it has been applied to the general case. 



In Part I. it has been shown that the functions expressing 

 the combining and the dissociating agencies have the same 

 form, and in Part II. that whenever two or more molecules 

 take part in the action, the form is probably either 



a 



or _" I 



* Cf. Van 't Hoff, Etudes, p. 114. 



