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 Sons, 1897 - 312 pagine |
Dall'interno del libro
Risultati 1-5 di 29
Pagina 19
... modified . I claim only that in the balance and relative develop- ment of their organic systems - muscular , digestive , ner- vous , etc. they give us a very fair idea of what our ancestor at each stage must have been . But it is on ...
... modified . I claim only that in the balance and relative develop- ment of their organic systems - muscular , digestive , ner- vous , etc. they give us a very fair idea of what our ancestor at each stage must have been . But it is on ...
Pagina 27
... modified during the lapse of ages . But I shall try to tell you when they have diverged noticeably from the structure of the primitive ancestor of the corresponding stage . It is much safer for us to study concrete , actual forms than ...
... modified during the lapse of ages . But I shall try to tell you when they have diverged noticeably from the structure of the primitive ancestor of the corresponding stage . It is much safer for us to study concrete , actual forms than ...
Pagina 42
... modified in form and structure for the performance of a special work or function . The protozoa developed the cell for all time to come , the cœlenterata developed the tissues which still compose our bodies . But they had them mainly in ...
... modified in form and structure for the performance of a special work or function . The protozoa developed the cell for all time to come , the cœlenterata developed the tissues which still compose our bodies . But they had them mainly in ...
Pagina 46
... modified , it has still retained many char- acteristics almost certainly possessed by our primitive bilateral ancestor . The different parts of hydra were arranged like those of most flowers , around one main vertical axis ; it was thus ...
... modified , it has still retained many char- acteristics almost certainly possessed by our primitive bilateral ancestor . The different parts of hydra were arranged like those of most flowers , around one main vertical axis ; it was thus ...
Pagina 53
... modified patches of the peritoneum , or lining of the perivisceral cavity . The number of muscles or muscular layers has been reduced in this animal . But such a reduction in the number of like parts in any animal is a sign of prog ...
... modified patches of the peritoneum , or lining of the perivisceral cavity . The number of muscles or muscular layers has been reduced in this animal . But such a reduction in the number of like parts in any animal is a sign of prog ...
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 - 1896 |
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 better birds body brain cells conformity to environment conscious degeneration dominant ectoderm embryo embryology existence experience eyes fish functions future ganglion gastrula gills give groups 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 membrane ment mental mind mode modified mollusks moral mouth muscles muscular muscular system mutability of species natural selection nephridia nerve nervous system never notochord nutriment organs oxygen parapodia perception perivisceral cavity possible primitive probably progress protoplasm protozoa purely race 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 vertebrates volvox young