The Whence and the Whither of Man: A Brief History of His Origin and Development Through Conformity to Environment; Being the Morse Lectures of 1895C. Scribner's son, 1896 - 312 pagine |
Dall'interno del libro
Risultati 6-10 di 27
Pagina 43
... primitive form . The fertilized egg of any animal consists of a single cell , a little mass of protoplasm containing a nucleus and surrounded by a struct- ureless membrane . The egg is globular . The nucleus undergoes certain very pe ...
... primitive form . The fertilized egg of any animal consists of a single cell , a little mass of protoplasm containing a nucleus and surrounded by a struct- ureless membrane . The egg is globular . The nucleus undergoes certain very pe ...
Pagina 45
... primitive digestive cav- ity ; and the opening at the end to the primitive mouth or blastopore . Ectoderm and entoderm unite around the mouth . Both the blastosphere and gastrula often swim freely by flagella . You can hardly have ...
... primitive digestive cav- ity ; and the opening at the end to the primitive mouth or blastopore . Ectoderm and entoderm unite around the mouth . Both the blastosphere and gastrula often swim freely by flagella . You can hardly have ...
Pagina 46
... primitive bilateral ancestor . The different parts of hydra were arranged like those of most flowers , around one main . vertical axis ; it was thus radiate in structure , having neither front nor rear , right nor left side . But our ...
... primitive bilateral ancestor . The different parts of hydra were arranged like those of most flowers , around one main . vertical axis ; it was thus radiate in structure , having neither front nor rear , right nor left side . But our ...
Pagina 51
... primitive an animal could not originally have had so highly developed a system , and that this char- acteristic must be acquired , not ancestral . That certain portions of it may be later develop- ments may be not only possible but ...
... primitive an animal could not originally have had so highly developed a system , and that this char- acteristic must be acquired , not ancestral . That certain portions of it may be later develop- ments may be not only possible but ...
Pagina 55
... primitive ancestor , many lines diverged . And this was to be expected . The colenterata , as we saw in hydra , had developed rude digestive and reproduc- tive systems . The higher groups of this kingdom had CHAPTER III WORMS TO ...
... primitive ancestor , many lines diverged . And this was to be expected . The colenterata , as we saw in hydra , had developed rude digestive and reproduc- tive systems . The higher groups of this kingdom had CHAPTER III WORMS TO ...
Altre edizioni - Visualizza tutto
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1896 |
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1897 |
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1899 |
Parole e frasi comuni
advance amoeba amphibia anatomical ancestors animal kingdom annelid apes appear appetite archenteron attained become beginning better birds body brain cells cerebrum characteristics conformity to environment conscious degeneration dominant ectoderm embryo embryology entoderm experience eyes fish functions future ganglion gastrula germ-plasm give groups heredity higher animals higher forms highest human hydra important increase individual insect instinct intelligence jaws knowledge laws layer legs living locomotion lower mammals man's marsupial ment mental mind mode modified mollusks moral motives muscles muscular muscular system natural selection nephridia nerve nervous system never notochord nutriment organs oxygen parapodia perception possible primitive probably progress protoplasm protozoa purely reflex action reptiles result schematic worm segments selfish sense-organs sequence shell skeleton species spermatozoa stage structure struggle surface survive swimming theory of evolution tion tissues true truth turbellaria unselfishness variation velopment vertebral column vertebrates volvox young