J 8 ERNEST WARREN. 



of coloured lores, it is nowhere possible to speak of a character 

 as being dominant. In this case the actual colour of the 

 lores is to be disregarded, and only the fact that some of the 

 feathers of the lores are wholly coloured and not white in 

 their upper portions would have to be taken into considera- 

 tion. But the coloured area between the eye and the bill is 

 relatively smaller in the hybrids than in Licmetis, and this 

 is particularly the case in the younger hybrid. On the whole, 

 therefore, it would appear easier to regard the condition seen in 

 the hybrids as resulting from a blend of the male and female 

 characters with a slight prepotency on the part of the female, 

 than to take the view that the presence of the coloured lores 

 is an example of dominance in the Mendelian sense. 



Finally, it may be said that out of these ten characters the 

 hybrid is nearer to Cacatua in five, nearer to Licmetis in 

 one, and almost exactly intermediate in four. 



The characters which lend themselves more readily to 

 numerical expression may be summarised in the accompanying 

 table (p. 17). 



In the fifth column the measurements in the hybrid are 

 given, and in the third and seventh columns the differences 

 between these measurements and those of the male (second 

 column) and female (eighth column) respectively are shown. 

 These differences, expressed in percentages of the measure- 

 ments of the hybrid, are given in the fourth and sixth columns. 

 Thus, for example, with respect to the length of the tail the 

 divergence of the hybrid from the male- and female-parent 

 expressed in percentage of the length of the tail in the 

 hybrid is 14 per cent, and 32 per cent, respectively ; and 

 the hybrid in this character is therefore 18 per cent, further 

 removed from the female (L. nasica) than from the male 

 (C. galerita). The means of these percentage ratio- 

 differences between the hybrid and the parents in the eight 

 characters tabulated are 25 per cent, for the male and 32 per 

 cent, for the female. In other words, on the average, ratio- 

 deviation of the hybrid from the male : ratio-deviation of the 

 hybrid from the female : : 25 : 32. 



