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
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Pagina v
... nerve - cords . CHAPTER III WORMS TO VERTEBRATES : SKELETON AND HEAD . 55 Worms and the development of organs . - Mollusks : The external protec- tive skeleton leads to degeneration or stagnation . - Annelids and arthro- pods : The ...
... nerve - cords . CHAPTER III WORMS TO VERTEBRATES : SKELETON AND HEAD . 55 Worms and the development of organs . - Mollusks : The external protec- tive skeleton leads to degeneration or stagnation . - Annelids and arthro- pods : The ...
Pagina vi
... nervous action . - Reflex action , unconscious and comparatively mechanical . -Instinctive action : The actor is conscious , but guided by heredity . — In- telligent action . - The actor is conscious , guided by intelligence resulting ...
... nervous action . - Reflex action , unconscious and comparatively mechanical . -Instinctive action : The actor is conscious , but guided by heredity . — In- telligent action . - The actor is conscious , guided by intelligence resulting ...
Pagina 19
... nervous , that my argument will in the main be based . But if the older ancestors have so generally dis- appeared , and their surviving relatives have been so greatly modified , how can we make even a shrewd guess at the ancestry of ...
... nervous , that my argument will in the main be based . But if the older ancestors have so generally dis- appeared , and their surviving relatives have been so greatly modified , how can we make even a shrewd guess at the ancestry of ...
Pagina 38
... nervous cells and fibrils . As in every nervous system , three elements are here to be found . 1. An afferent or sen- sory nerve - fibril , which under adequate stimulus is set in vibration by some cell of the epidermis or ectoderm ...
... nervous cells and fibrils . As in every nervous system , three elements are here to be found . 1. An afferent or sen- sory nerve - fibril , which under adequate stimulus is set in vibration by some cell of the epidermis or ectoderm ...
Pagina 45
... intestine and of its glands has arisen from the entoderm . And only the epidermis , or outer layer of our skin , and the nervous system and parts of our sense - organs have arisen from the ectoderm . But PROTOZOA TO WORMS 45.
... intestine and of its glands has arisen from the entoderm . And only the epidermis , or outer layer of our skin , and the nervous system and parts of our sense - organs have arisen from the ectoderm . But PROTOZOA TO WORMS 45.
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