14 Robinson, The Conjugation of Partial Valencies 



. for 

 Q— triphenyl 



methyl. 



The explanation of the nature of loose additive compounds, 

 such as the picrates of aromatic hydrocarbons, on the basis of 

 the theory of divisible valency is so obvious as not to require 

 further elaboration. Water of crystallisation and the 

 ammonia of the metal-ammines no doubt involve the bipolar 

 partially dissociated forms 



HoO'-" 



and 



H 8 N 



with the aid of which it. is possible to construct formulae for 

 hydrated salts and the most complex of the compounds now 

 represented in accordance with Werner's co-ordination theory. 

 The author gratefully acknowledges the influence of the 

 writings of Werner, Thiele, Flurscheim, Decker, KaufTmann 

 and particularly Lapworth, with whom he has had the great 

 advantage of frequently discussing these and similar problems. 



