450 Darwin, and after Larwin. 
—so essentially important for his theory—he does not even 
attempt to show. Lastly and quite apart from these remarkabie 
oversights, even if Mr. Tylor’s hypothesis were as reasonable and 
well-sustained as it is fanciful and inadequate, still it could not 
apply to sexva/ colouration : it could apply only to colouration 
as affected by physiological functions common to both sexes. 
Yet it is in order to furnish a “ preferable substitute” for Mr. 
Darwin's theory of sexzad/ colouration, that Mr. Wallace adduces 
the hypothesis in question as one of “great weight”! In this 
matter, therefore, I entirely agree with Poulton and L'oyd 
Morgan. 
