HOMOLOGY. 85 



and in another in the Annulosa, by some in- 

 telligent* Power in order to produce the re- 

 quired result. In any case, the facts can only 

 be interpreted as due to intelligent supervision ; 

 but the secondary laws by which this has acted 

 are at present but little known, though one 

 of them is in all probability the law of correl- 

 lation of growth. 



The eyes of the Vertebrata differ in power 

 in almost every species, being modified accord- 

 ing to the peculiar requirements, of each. It 

 is believed that those of nocturnal animals 

 have the power of perceiving certain rays of 

 the spectrum which are invisible to ourselves. 

 Lubbock has recently shown that the colour- 

 perceptions of ants are different to and appa- 

 rently far more extended than our own. I once 

 read of a naturalist who contrived an ap- 

 paratus by which he succeeded in looking 

 through the compound eye of a dragon-fly, 

 with the effect of producing a multiplied and 

 greatly reduced image of the object observed. 

 It is very doubtful whether this is the normal 



* We can hardly suppose the existence of an unintelligent Power, or 

 a blind force, in such a connection, unless we regard it merely as itself 

 an a^ent. 



