xiv INSTANCES OF THE WONDER OF LIFE 



PAGE 



rats, rat-fleas, and plague Bacilli . . - . & . . 364 

 yellow fever and the Stegomyia mosquito . . . . 365 



the importance of the white heron ..... 366 



the fate of the passenger pigeon . . . . .366 



the correlation of organisms in the web of life . . 368 



the various curves of life ' . ' >" .... 373 



the development of the egg .' . : . . . . 375 



development of a fraction of an egg '-. . . . 378 



many embryos from one egg . ' , . . . . 379 



the ripening of the egg '*' ' *' . V . . . 381 



the fertilization of the egg . . '- % v -- . . . 382 



artificial parthenogenesis . > . , . . 383 



a remarkable case of hybridization ..... 389 



the development of nerve-fibres . *' , - ' '. . 390 



the distinctiveness of organic growth .... 398 



internal secretions in relation to growth . '. . . . 399 



organisms of unlimited growth . . . '. . .401 



structural registration of growth . .'-' . . 402 



regulation of growth . . . . ;.* . . 404 



the meaning of youth ..-.-. * . *" 408 



the play of animals , . ... . . 408 



courtship among animals . . . ; . , r 410 



combats of males . . . ; -: . . . 412 



significance of courtship -behaviour . . ' -j ' ' ;. : . 415 



habits of sea -lions , * , . ', . ' ' 416 



fragrance of butterflies . . . ' . . ' * .' 416 



audible signalling on the part of a male moth . . . 417 



post-matrimonial cannibalism ...... 419 



parental care . , . . . . ... 420 



paternal care ' - , . . . . . i 422 



the remarkable behaviour of the bee-hunter . ' , 425 



habits of dung-rolling beetles . . V' ''. . * 426 



brooding insects . . . . . . .' 427 



over two thousand feathers from the nest of the long-tailed tit 427 



the tabula rasa of the young bird's brain . . . 430 



the chain of parental instincts . . , . .' 431 



the prevalence of other-regarding activities i- * ] , 433 



longevity of animals . . '" . . ' i-'- . . . 435 



a centenarian tortoise * . * ; "4 ' . 436 



the different kinds of death . . - > . . 439 



