A FUKTllEK NOTE ON IIYJJKID COCKATOOS. 509 



aUhougli not quite^ white in hybrid 3. In hybrid 1 the 

 naked area around the eye is roughly circular in ^^hape, and 

 is about intermediate in size; while in hybrid 3 it is nearer 

 to that in Cacatua. In the granulation of the eyelids 

 hybrid 1 approaches Cacatua, nnd hybrid 3 is more or less 

 intermediate. In the colour of the bill hybrid 3 is more 

 distinctly intermediate than is hybrid 1. 



Hybrid 2 is less like the male-parent than is the case in 

 the other two hybrids ; the naked area around the eye is 

 distinctly blue and its shape approaches that in Licmetis. 

 The prominence of the forehead is medium, but it is less 

 marked than in the first hybrid. Thus in five characters 

 the second hybrid approaches Cacatua, in two characters 

 it is intermediate, and in three characters it is nearer to 

 Licmetis. There is still prepotency on the part of the 

 male-parent, ])ut it is less pronounced than in the first and 

 third hybrids. 



The greater divergence of the second hybrid from the male- 

 parent is confirmed by an examination of Table II showing 

 the characters which were measured. Here the mean of the 

 percentage divergences of the second hybrid from the father, 

 expressed in terms of the characters in the former, is 29 per 

 cent., as compared with 25 per cent, in the case of the first 

 hybrid and 23 per cent, in the case of the young bird. 



The means of the percentage divergences from the male- 

 parent (Cacatua) and the female-parent (Licmetis) are 

 respectively for the first hybrid 25 per cent, and 32 per cent., 

 for the second hybrid 29 per cent, and 33 per cent., for the 

 third hybrid 23 per cent, and 35 per cent., and the averages 

 for the three hybrids are 26 per cent, and 33 per cent. In 

 all the hybrids there is a general average prepotency of the 

 male-parent, but it is lest obvious in the second hybrid. 



Thus on the whole the same order of magnitude is main- 

 tained in all three hybrids, although there is considerable 

 variation in the expression of the different characters. 



With only three individuals to deal with it is not possible 

 to draw any very definite conclusions, but the differences 



