
No.42 LAW OF ADAPTIVE RADIATION. 363 
entire animal from either a claw ora tooth. Thus, while the 
law of correlation is no less dominant than Cuvier supposed, 
only a vestige is left of the mode of archetypal operation of 
the law as he conceived it. It may be now restated as fol- 
lows: Feet (correlated chiefly with limb and body structure) 
and teeth (correlated chiefly with skull and neck structure) 
diverge independently in adaptation respectively to securing 
and eating food under different conditions. Each evolves 
directly for its own mechanical functions or purposes, yet in 
such a manner that each subserves the other. 
Correlation is therefore not morphological, as Cuvier sup- 
posed, but physiological, function always preceding structure. 
It becomes closest where teeth and feet combine in the same 
function as in the prehensile canines and claws of the Felidz, 
and most diverse where the functions are most diverse, as in 
the teeth and paddles of the Pinnipedia. 

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$ 
