vill ILLUSTRATIONS 
FIG. PAGE 
15. Newly-hatched Chick swimming. (Drawn by Mr Charles 
Whymper, after instantaneous photographs and a sketch 
by the author)! sos: 4... Sage aioe ae Neen ee 
16. Nestling Megapode. (From Dr. R. Bowdler oe 3“ Wonders 
of the Bird World.” Wells Gardner) . . erent Sete 
17. Cuckoo ejecting Meadow Pipit. (From Mrs. Hugh Black- 
burn’s sketch in “ Birds from Moidart.” David Douglas) . 91 
1S: . \seaf-case oh birch=weevil < sense venues lous ret re mando 
19. Solitary Wasp using a stone as a tool. (After Plate V. in 
Drs Beckhams) “Solitary Wasps igo) seme genet en mere ene Laiy 
20. Spiders placed by Solitary Wasps in crotches of branching | 
stems. (After Plate X.in Dr. Peckham’s “Solitary Wasps”) 133 
21. Fox-terrier lifting the latch of a gate. (Drawn by Mr. Charles 
Whymper, after a photograph by Miss Alice Worsley) . . 145 
22. Cage used by Dr. Thorndike. (After figure in “ Animal 
Intelligence,” Psychological Review, 1898) . . . . . 148 
23. Diagram illustrating Dr. Thorndike’s Experiments. (Based 
on data given in his monograjh on “ Animal Intelligence”) 150 
24. Wood ant. (From Shipley’s “Invertebrates.” A.&C. Black) 207 
25. Beetle soliciting food from Ant. (After Wasmann. Enlarged) 213 
26. Honey-pot Ant. (Enlarged) . «© «© «© « «© «© += « « 215 
