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 22
Pagina v
... reproductive organs , and of tissues . - Forms intermediate between amoeba and hydra : Magosphæra , volvox . - Embryonic development . - Turbellaria : Appearance of a body wall , of ganglion , and nerve - cords . CHAPTER III WORMS TO ...
... reproductive organs , and of tissues . - Forms intermediate between amoeba and hydra : Magosphæra , volvox . - Embryonic development . - Turbellaria : Appearance of a body wall , of ganglion , and nerve - cords . CHAPTER III WORMS TO ...
Pagina 38
... reproductive organs for the production of eggs and spermatozoa form little protuberances on the out- side of the body below the tentacles . But hydra re- produces mostly by budding ; new individuals grow- ing out of the side of the old ...
... reproductive organs for the production of eggs and spermatozoa form little protuberances on the out- side of the body below the tentacles . But hydra re- produces mostly by budding ; new individuals grow- ing out of the side of the old ...
Pagina 41
... reproductive elements , eggs and spermatozoa . Fertili- zation , that is , the union of egg and spermatozoon , or mainly of their nuclei , takes place ; and the fertilized egg develops into a new organism . But the other cells , which ...
... reproductive elements , eggs and spermatozoa . Fertili- zation , that is , the union of egg and spermatozoon , or mainly of their nuclei , takes place ; and the fertilized egg develops into a new organism . But the other cells , which ...
Pagina 42
... reproductive cells . The other cells nourish and transport them and carry on the work of excretion and respiration . These latter correspond practically to our whole body . We call them somatic cells . In volvox they are entirely ...
... reproductive cells . The other cells nourish and transport them and carry on the work of excretion and respiration . These latter correspond practically to our whole body . We call them somatic cells . In volvox they are entirely ...
Pagina 50
... reproductive . It is doubtful whether any animal , except , perhaps , the mollusk , has as compli- cated and highly developed reproductive organs . By markedly higher 50 THE WHENCE AND THE WHITHER OF MAN.
... reproductive . It is doubtful whether any animal , except , perhaps , the mollusk , has as compli- cated and highly developed reproductive organs . By markedly higher 50 THE WHENCE AND THE WHITHER OF MAN.
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