14 ANIMAL INDIVIDUALITY [CH. 



means of the memory, each can be summoned up as 

 it is wanted. No doubt accompanying them there 

 are physical and chemical differences in the nervous 

 tissue, causing differences of continuity between the 

 various neurones, but this physical heterogeneity is of 

 no obvious or visible kind. The broad differences, 

 the differences that can be felt, lie in the states of 

 consciousness, so that the individual, after advancing 

 a long way in its march towards perfect individuality 

 by means of heterogeneity of co-existent structures, 

 has got to its present position by adding to this a new 

 device, heterogeneity of states of consciousness, which 

 states, through not being co-existent, can be more 

 numerous and more heterogeneous than ever the 

 structures could. 



One last attribute of the individual, but a very 

 important one. So far the individual has emerged 

 as " Unity in Diversity." It shows diversity both in 

 what it is its physical structure and the architecture 

 of its consciousness and in what it does the actions 

 which more truly constitute its real essence. It also 

 has unity, because though all its heterogeneity of 

 architecture is devoted to producing heterogeneity 



with each other in cyclical change ; here, the memory obviates the 

 necessity for that. Though two states of consciousness cannot 

 actually co-exist at one moment of time, for all practical purposes 

 memory permits it, as when we say that a man can attend to his 

 profession and write a book upon some other subject "both at once," 

 pr as when a chess-player plays a dozen games ' ' simultaneously." 



