ORGANIC E VOL UTION. 7 5 



dom, there is no one instance of a mechanism 

 or instinct occurring in one species for the ex- 

 clusive benefit of another species, although there 

 are a few cases in which a mechanism or instinct 

 that is of benefit to its possessor has come also 

 to be utilised by other species. Now, on the 

 beneficent design theory it is impossible to explain 

 why, when all the mechanisms in the same 

 species are invariably correlated for the benefit 

 of that species, there should never be any such 

 correlation between mechanisms in different 

 species, or why the same remark should apply 

 to instincts. For how magnificent a display of 

 divine beneficence would organic nature have 

 afforded, if all, or even some, species had been 

 so inter-related as to minister to each other's 

 necessities. Organic species might then have 

 been likened to a countless multitude of voices 

 all singing in one harmonious psalm of praise. 

 But, as it is, we see no vestige of such co-ordi- 



