28 ERNEST WARBEN. 



require analysing into their component parts before the 

 Mendelian relation becomes apparent, I cannot enter here, 

 and can but remark that this view offers a wide iield for 

 experimentation. 



EXPLANATION OF PLATE II, 



Illustrating Dr. E. Warren's paper, " A Case of Hybridism 

 among Cockatoos," 



Fig. 1. — X f. Side view of head and neck of Licmetis nasica, 

 female-parent. 



Fig. 2. — x f. Similar side view of Cacatua galerita, male-parent. 



Fig. 3. — x f . Hybrid three years old. 



Fig. 4. — x f . Hybrid three months old. 



