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 30
Pagina 32
... portion is clear and transparent , its inner more granular . In the inner portion is a little sphe- roidal body , the nucleus . This is certainly of great importance in the life of the animal ; but just what it does , or what is its ...
... portion is clear and transparent , its inner more granular . In the inner portion is a little sphe- roidal body , the nucleus . This is certainly of great importance in the life of the animal ; but just what it does , or what is its ...
Pagina 46
... portion of the lining of the human mid - in- testine covered with a little flake of epidermis . This much the hydra has attained . But our bones and muscles and blood - vessels all come from the mesoderm by folding , plaiting , and ...
... portion of the lining of the human mid - in- testine covered with a little flake of epidermis . This much the hydra has attained . But our bones and muscles and blood - vessels all come from the mesoderm by folding , plaiting , and ...
Pagina 50
... portion of the margin , and certain other characteristics of the adult structure and of the embryonic development , are very interesting , as giving hints of the development of the turbellaria from some radiate ancestor . The mouth is ...
... portion of the margin , and certain other characteristics of the adult structure and of the embryonic development , are very interesting , as giving hints of the development of the turbellaria from some radiate ancestor . The mouth is ...
Pagina 51
... portions of it may be later develop- ments may be not only possible but probable . But anyone who has carefully studied the different groups of worms , will , I think , readily grant that in the stage * Cf. p . 35 . of these flat worms ...
... portions of it may be later develop- ments may be not only possible but probable . But anyone who has carefully studied the different groups of worms , will , I think , readily grant that in the stage * Cf. p . 35 . of these flat worms ...
Pagina 52
... portions can be readily dis- tinguished fore - intestine with the mouth , mid - intes- tine , as the seat of digestion and absorption , and hind- intestine , or rectum , with the anal opening . The front and hind - intestine are lined ...
... portions can be readily dis- tinguished fore - intestine with the mouth , mid - intes- tine , as the seat of digestion and absorption , and hind- intestine , or rectum , with the anal opening . The front and hind - intestine are lined ...
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