36 Prof. Ernst Haeckel 



" unthinkable." The music sensation is the resultant, the 

 unthinkable correlate, of just such a concomitant nerve- 

 change, and no other ; and that nerve-change dep'ends upon 

 the correlation of the whole world, which stands behind and 

 accompanies it. The consciousnesses of man, and the co- 

 operation by which they become the Ego, may be called the 

 felt music which the world constantly plays on our nervous 

 systems, sensitive and quivering with their own unstable and 

 assimilative life processes. Or, to say it again, like the color 

 music, when the apparently solid rainbow springs from the 

 falling drops as the sunlight plays upon them. That the 

 psychical changes are " co-related " to the physical changes in 

 the nerves,_ Mr. Spencer would doubtless admit, but the 

 correlation is only complete when we take into account the 

 generally omitted factor, the world environment, which 

 really plays the music. Speculations on this subject are 

 generally vitiated by the omission of or failure to realize this 

 factor. 



Thus it is in the organic world of nerve-action, and the 

 mental world of consciousness, correlation is the bond of 

 unlikes. Nor less is it true in sociology. The " body cor- 

 porate and political," the Leviathan, as Hobbes calls it, exists 

 as the co-operation of all the individuals and sub-organiza- 

 tions which compose it and influence its action. But the 

 city, county, state, and nation is not to be found by any 

 analysis of those parts. There is no city or quality of a city 

 in any one citizen no "teaminess" in one ox. Yet we 

 have anarchists constantly reminding us that the whole 

 can not be greater than all its parts ! Just as though it 

 could be anything like them, or they greater than it or 

 like it? 



It is necessary to bear in mind this law of the unlikeness 

 of inseparable correlates, or monism can never be under- 

 stood. When it is understood, the ever-varying world is 

 made one, and is at the same time unlocked by it. Haeckel 

 has beautifully illustrated this law in biology, where he has 

 frequently made discoveries that would make the fortune 

 and fame of ordinary naturalists. Take, for instance, his 

 Evolution of Man, and follow the relations of the race in 

 history and of the individual in embryo through the twenty- 

 two stages. (On pages 44 and 189, vol. ii, of the Evolution 

 of Man.) _The formation of cells is correlated to their past 

 and to their environment in the four simpler states. Then 

 the inner and outer skins change forms, and develop into four 



