510 ERNEST WARKEN. 



between the brother hybrids would seem to be greater than 

 might be expected to occur between three pure-bred 

 brethren. 



Another point of interest may be mentioned. The eyes of 

 the hybrids, as represented by the area of the eyeball 

 exposed when the eyelids are wide open, are distinctly larger 

 than in either the male- or female-parent, and this condition 

 is especially marked in the second hybrid where the area is 

 equal to 51 sq. mm., while in the male Cacatua it is 31 sq. 

 mm., and in the female Licmetis 25 sq. mm. The appear- 

 ance in a hybrid of a new character not clearly connected 

 with either parent would seem to be especially worthy of 

 investigation, but the data at present to hand are too scanty 

 for any detailed examination. 



