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 75
Pagina xii
... muscular system cannot develop and do its work until some sort of a digestive system has arisen to furnish nutriment , any more than a steam- engine can run without fuel . And a brain is of no use until muscle and sense - organs have ...
... muscular system cannot develop and do its work until some sort of a digestive system has arisen to furnish nutriment , any more than a steam- engine can run without fuel . And a brain is of no use until muscle and sense - organs have ...
Pagina 13
... muscle or pluck would make all the difference between winning and losing the prize . Similarly the million or more young of any species of insect in a given area may be said to run a race of which the prize is life , and the losing of ...
... muscle or pluck would make all the difference between winning and losing the prize . Similarly the million or more young of any species of insect in a given area may be said to run a race of which the prize is life , and the losing of ...
Pagina 19
... 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 this balance and relative development of the different systems , that is , whether an animal is more ...
... 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 this balance and relative development of the different systems , that is , whether an animal is more ...
Pagina 32
... of our muscular cells . Prick it with a needle and it con- ... ek tracts . It recognizes its food even at CHAPTER II PROTOZOA TO WORMS: CELLS, TISSUES, AND ORGANS Amœba: Its anatomy and physiology —Development of the cell.
... of our muscular cells . Prick it with a needle and it con- ... ek tracts . It recognizes its food even at CHAPTER II PROTOZOA TO WORMS: CELLS, TISSUES, AND ORGANS Amœba: Its anatomy and physiology —Development of the cell.
Pagina 38
... muscles are contracted , the pressure of the water length- ens the body and tends to extend the tentacles . On the ... muscle , exciting its contraction . But there are also nerve - fibrils connect- ing the different ganglion cells , so ...
... muscles are contracted , the pressure of the water length- ens the body and tends to extend the tentacles . On the ... muscle , exciting its contraction . But there are also nerve - fibrils connect- ing the different ganglion cells , so ...
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