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 1-5 di 33
Pagina 33
... surface . Its mode of gaining the en- ergy which it manifests is therefore apparently like our own , by com- bustion of food mate- rial . ... ek . 1. AMOEBA PROTEUS . HERTWIG , FROM LEIDY . ek , ectosarc ; en , endosarc ; N , food par ...
... surface . Its mode of gaining the en- ergy which it manifests is therefore apparently like our own , by com- bustion of food mate- rial . ... ek . 1. AMOEBA PROTEUS . HERTWIG , FROM LEIDY . ek , ectosarc ; en , endosarc ; N , food par ...
Pagina 35
... surface four times , its mass eight - fold . Now the power of absorbing oxygen and excreting waste is evidently proportional to the excretory and respiratory surface , and much the same is true of digestion . But the amount of oxygen ...
... surface four times , its mass eight - fold . Now the power of absorbing oxygen and excreting waste is evidently proportional to the excretory and respiratory surface , and much the same is true of digestion . But the amount of oxygen ...
Pagina 36
... surface by folding and plaiting . And the complicated internal structure of higher ani- mals is in its last analysis such a folding and plaiting in order to maintain the proper ratio between the ex- posed surface of the cells and their ...
... surface by folding and plaiting . And the complicated internal structure of higher ani- mals is in its last analysis such a folding and plaiting in order to maintain the proper ratio between the ex- posed surface of the cells and their ...
Pagina 37
... surface of the water or to slowly creep on the bottom . The mouth is at the top of the vase , and the simple , undi- vided cavity within the vase is the digestive cavity . Around the mouth is a ring of from four to ten hollow tentacles ...
... surface of the water or to slowly creep on the bottom . The mouth is at the top of the vase , and the simple , undi- vided cavity within the vase is the digestive cavity . Around the mouth is a ring of from four to ten hollow tentacles ...
Pagina 38
... surface of the elastic supporting membrane . The 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 ...
... surface of the elastic supporting membrane . The 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 ...
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