48 Colouration in Animals and Plants. 



There is, however, one set of colour lines in birds and insects 

 that do not seem to arise from spots in the ordinary way. These 

 are the coloured feather-shafts of birds, and the coloured nerves or 

 veins in a butterfly's wing, In these the colour has a tendency to 

 flow all along the structure in lines. 



Conclusion. The results arrived at in this chapter may be thus 

 summarised : — 



Spots, ocelli, stripes, loops, and patches may be, and nearly 

 always are, developed from more or less irregular spots. 



This is shown both by the study of normal colouring, or by 

 abnormal colouring, or decolouring in disease. 



Even the celebrated case of the Argus Pheasant shows that 

 the bands from which the ocelli are developed arose from spots. 



