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 19
Pagina v
... Turbellaria : Appearance of a body wall , of ganglion , and 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 ...
... Turbellaria : Appearance of a body wall , of ganglion , and 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 ...
Pagina 43
... will lie horizontal or equatorial , and will divide each of these quarters into an upper and lower octant . The. 3. IMMATURE EGG - SHELL FROM OVA- RY OF ECHINODERM . HATSCHEK , FROM HERTWIG . 5. TURBELLARIAN . LANG . PROTOZOA TO WORMS 43.
... will lie horizontal or equatorial , and will divide each of these quarters into an upper and lower octant . The. 3. IMMATURE EGG - SHELL FROM OVA- RY OF ECHINODERM . HATSCHEK , FROM HERTWIG . 5. TURBELLARIAN . LANG . PROTOZOA TO WORMS 43.
Pagina 46
... turbellaria , while still without a head , has one end which goes first and can be called the front end . The upper or dorsal surface is usually more colored with pigment cells than the lower or ventral surface , on which is the mouth ...
... turbellaria , while still without a head , has one end which goes first and can be called the front end . The upper or dorsal surface is usually more colored with pigment cells than the lower or ventral surface , on which is the mouth ...
Pagina 47
... turbellaria is still covered with cilia , probably an inheritance from the gastræa ; for , while in smaller forms they may still be the prin- cipal means of locomotion , in larger ones the muscles are beginning to assume this function ...
... turbellaria is still covered with cilia , probably an inheritance from the gastræa ; for , while in smaller forms they may still be the prin- cipal means of locomotion , in larger ones the muscles are beginning to assume this function ...
Pagina 48
... selection , Here the lookout for Hence , as a result of or both , the nerve- m.dv O plexus has thickened at this point into a. 5. TURBELLARIAN . LANG . 9. MYRMELEO FORMICARIUS . ANT - LION . HERTWIG ,. 48 THE WHENCE AND THE WHITHER OF MAN.
... selection , Here the lookout for Hence , as a result of or both , the nerve- m.dv O plexus has thickened at this point into a. 5. TURBELLARIAN . LANG . 9. MYRMELEO FORMICARIUS . ANT - LION . HERTWIG ,. 48 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