The Whence and the Whither of Man: A Brief History of His Origin and Development Through Conformity to Environment; Being the Morse Lectures of 1895W. Blackwood and Sons, 1896 - 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 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 gastręa ; 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 gastręa ; 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
... TURBELLARIAN . LANG . od therefore , no special respir- atory organs . But the waste matter of the muscles cannot escape so easily , for these are becoming deeper seated . Hence we find an excretory system consisting of two tubes with ...
... TURBELLARIAN . LANG . od therefore , no special respir- atory organs . But the waste matter of the muscles cannot escape so easily , for these are becoming deeper seated . Hence we find an excretory system consisting of two tubes with ...
Pagina 49
... turbellaria we find otolith vesicles . 2 청 6. CROSS - SECTION OF TURBELLARIAN . HATSCHEK , FROM JIJIMA , e , external skin ; rm , lateral muscles ; la and li , longitudinal muscles ; mdv , dorso - ventral muscles ; pa , parenchyma ; h ...
... turbellaria we find otolith vesicles . 2 청 6. CROSS - SECTION OF TURBELLARIAN . HATSCHEK , FROM JIJIMA , e , external skin ; rm , lateral muscles ; la and li , longitudinal muscles ; mdv , dorso - ventral muscles ; pa , parenchyma ; h ...
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
amoeba amphibia anatomical ancestors animal kingdom annelid apes appear appetite attained become birds body brain cavity cells cerebrum Cheaper Edition church conformity to environment conscious Crown 8vo degeneration Demy 8vo digestive dominant ectoderm embryo evolution experience eyes Fcap fish functions ganglion gastrula germ-plasm give groups higher forms highest human hydra Illustrations increase individual insect instinct intelligence laws layer legs living locomotion lower mammals man's marsupial ment mental mind mode modified mollusks moral muscles muscular natural selection nerve nervous system never notochord nutriment organs oxygen parapodia perception perivisceral Portrait Post 8vo primitive probably Professor progress protoplasm protozoa purely reflex action reproductive reptiles result schematic worm Scotland segments selfish sense-organs sequence skeleton species stage structure struggle surface survive swimming theory tion true truth turbellaria University of Edinburgh variation velopment vertebral column vertebrates vols volvox WHITHER young