The Study of Animal LifeScribner, 1892 - Всего страниц: 375 |
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Стр. x
... male - cell or spermatozoon - 6 . Matura- tion of the ovum - 7 . Fertilisation - 8 . Segmentation and the first stages in development - 9 . Some generalisations : the ovum theory , the Gastrea theory , fact of recapitulation , organic ...
... male - cell or spermatozoon - 6 . Matura- tion of the ovum - 7 . Fertilisation - 8 . Segmentation and the first stages in development - 9 . Some generalisations : the ovum theory , the Gastrea theory , fact of recapitulation , organic ...
Стр. 2
... presence ; and has stood so still to see the male redstart that a field - mouse has curled itself on his warm foot and gone to sleep . " 66 But the student must also attempt more careful studies 2 PART I The Study of Animal Life.
... presence ; and has stood so still to see the male redstart that a field - mouse has curled itself on his warm foot and gone to sleep . " 66 But the student must also attempt more careful studies 2 PART I The Study of Animal Life.
Стр. 40
... males a contest for the possession of the females , —a competition in which beauty and winsomeness are sometimes as im- portant as strength . Contrast the musical competition between rival songsters with the fierce combats of the stags ...
... males a contest for the possession of the females , —a competition in which beauty and winsomeness are sometimes as im- portant as strength . Contrast the musical competition between rival songsters with the fierce combats of the stags ...
Стр. 41
... male seal , for instance , guards his harem with ferocity . ( d ) Finally , physical nature is quite careless of life . Changes of medium , temperature , and moisture , continually occur , and the animals flee for their lives , adapt ...
... male seal , for instance , guards his harem with ferocity . ( d ) Finally , physical nature is quite careless of life . Changes of medium , temperature , and moisture , continually occur , and the animals flee for their lives , adapt ...
Стр. 65
... male cuttle - fishes sometimes part with one of their arms for special sexual purposes . A great many " worms " break very easily , and the severed parts are sometimes able to regrow the whole organism . Among the Echinoderms the ...
... male cuttle - fishes sometimes part with one of their arms for special sexual purposes . A great many " worms " break very easily , and the severed parts are sometimes able to regrow the whole organism . Among the Echinoderms the ...
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action activity adult Amphibians animals ants backboned become begin Biology birds bivalves body brain buds called carbonic carbonic acid Chambers's Encyclop changes characteristic ciliated colony colour complex corals crab creatures crustaceans cuttlefish Darwin division of labour earth Echinoderms egg-cell eggs embryo Encyclopædia energy Erasmus Darwin evolution Evolution of Sex fact female fertilised fishes food-canal freshwater frog function grow habit Haeckel heredity higher animals hydroid illustration individual influence Infusorians insects instincts jellyfish kinds lancelet larvæ less life-history living matter Lond male mammals mates medusoids molluscs Natural History natural selection naturalists nervous nest notochord observed offspring organism origin ovum parasites parents plants progress Protists protoplasm Protozoa recognise regard reproductive cells reptiles result Rotifers sea-anemones seems shells simplest animals skin sometimes species spermatozoa spiders sponges strange structure substances suggest surroundings theory tion tissues units variations Vertebrate worms young Zoea zoology