COLOUR ASD NIDIFICATION. 
177 
'**». y 
Sv. 
bi rc j s le slight differences between tlie sexes of those 
th e w! licli build concealed nests. On the other hand, 
gr eai ' 6l 'onces in colour between the sexes, whether 
On ^ ot small, may to a large extent be explained 
by t j'" Principle of the successive variations, acquired 
Sn tL 111 nles through sexual selection, having been 
to i] 16 rirst more or less limited in their transmission 
^ etria les. That the degree of limitation should 
ettrp,,; 10 different species of the same group will not 
*ot y ail y one who has studied the laws of inheritance, 
iga 0l , are so complex that they appear to us in our 
4 8 a , Uce to be capricious in their action. 37 
°f as I can discover there are very few groups 
ri \ v j , s c °ntaining a considerable number of species, 
‘!.' h nil have both sexes brilliantly coloured 
1 at ’ ^ ut this appears to be the case, as I hear 
, Sclater, with the Musophagm or plain- 
■ ers ‘ Nor do I believe that any large group 
<^si ’ a "bicli the sexes of all the species are widely 
% Ullil nr 
Nte 1 , 
• ■ b est 
tbe |^ a ^® rers of S. America ( Cotingidee ) offer one of 
Hint. ln stances : but with some of the species, in 
m colour: Mr. Wallace informs me that 
hcjj . j 1Us tances ; 
p, ° ma ^ e bas a splendid red breast, the female 
<% " Sl »« e red on her breast; and the females of 
°f th 6 S ^ ecies 8 bew traces of the green and other colours 
to lll; dos. Nevertheless we have a near approach 
rio. 
i<fiVe tal S ° Xlla ' similarity or dissimilarity throughout 
th P § lcm P 8 : and this, from what has just been said 
*W b'ctuatin 
^‘'Prising 
s bould 
Sur Prisin 
6 nature of inheritance, is a some- 
circumstance. But that the same 
largely prevail with allied animals is 
The domestic fowl has produced a 
P°V ***» to this effect in my work on ‘ Variation under Pomes- 
' , 0l i j ‘ ll - c hap. xii. 
N 
