The Descent of Man and Selection in Relation to Sex, 1. osa,3. köideP.F. Collier and Son, 1901 - 438 pages |
From inside the book
Results 1-5 of 100
Page 431
... sexes - Vocal organs . REP- TILES : Chelonians - Crocodiles - Snakes , colors in some cases protec- tive - Lizards , battles of - Ornamental appendages - Strange differences in structure between the sexes - Colors - Sexual differences ...
... sexes - Vocal organs . REP- TILES : Chelonians - Crocodiles - Snakes , colors in some cases protec- tive - Lizards , battles of - Ornamental appendages - Strange differences in structure between the sexes - Colors - Sexual differences ...
Page 436
... sexes , as this is the case with many rays . In the thornback ( Raia clavat ) the adult male has sharp - pointed teeth , directed backward , while those of the female are broad and flat , and form a pavement ; so that these teeth differ ...
... sexes , as this is the case with many rays . In the thornback ( Raia clavat ) the adult male has sharp - pointed teeth , directed backward , while those of the female are broad and flat , and form a pavement ; so that these teeth differ ...
Page 442
... sexual ornament , for the female does not exhibit a trace of it . In other species of the same genus both sexes possess a crest , and in at least one species neither sex is thus pro- vided . In many of the Chromidæ , for instance in ...
... sexual ornament , for the female does not exhibit a trace of it . In other species of the same genus both sexes possess a crest , and in at least one species neither sex is thus pro- vided . In many of the Chromidæ , for instance in ...
Page 448
... females ; and yet , when the sexes differ , the males are almost always the more conspicuously colored . The ova are fertilized immediately after being deposited ; and when this process lasts for several days , as in the case of the ...
... females ; and yet , when the sexes differ , the males are almost always the more conspicuously colored . The ova are fertilized immediately after being deposited ; and when this process lasts for several days , as in the case of the ...
Page 451
... female , this view can hardly be maintained . When we treat of birds we shall meet with analogous cases , where there has been a complete inversion of the usual attributes of the two sexes , and we shall then give what appears to be the ...
... female , this view can hardly be maintained . When we treat of birds we shall meet with analogous cases , where there has been a complete inversion of the usual attributes of the two sexes , and we shall then give what appears to be the ...
Other editions - View all
Common terms and phrases
acquired adult female adult male Africa allied American appear Argus pheasant Audubon beak beard beauty Birds of India black grouse blue Blyth body breeding season bright colors British Birds charm common common pheasant conspicuously colored courtship crest curious deer developed differ in color display distinct doubt fact feathers fighting fishes genus Gould habits hair head Hist horns ibid Ibis India inheritance instance Jerdon kinds latter less likewise Lubbock Malay Archipelago male birds mammals manner marked marriage modified moult musical natural selection Naturalist nearly nests observed ocelli offspring orna ornaments pair peacock plumage plumes possess probable Proc progenitors Quadrumana quadrupeds races red grouse remarks resemble the adult savages seen sexes sexual selection skin sometimes South America species spots stripes tail tail-coverts tail-feathers teeth tints tion Tragopan transmitted tribe tusks upper various vocal organs wild turkey wing-feathers wings women young Zoolog