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 31
Pagina 11
... birds , slowly as they increase , produce in a lifetime probably at least from twelve to twenty eggs . Now let us suppose that all these eggs developed , and all the birds lived out their normal period of life , and reproduced at the ...
... birds , slowly as they increase , produce in a lifetime probably at least from twelve to twenty eggs . Now let us suppose that all these eggs developed , and all the birds lived out their normal period of life , and reproduced at the ...
Pagina 15
... leads north or south or due west . But if from any mountain - top we can gain a clear bird's - eye view of its whole course , we easily dis- tinguish the main road , its turns become quite insig- THE PROBLEM : THE MODE OF ITS SOLUTION 15.
... leads north or south or due west . But if from any mountain - top we can gain a clear bird's - eye view of its whole course , we easily dis- tinguish the main road , its turns become quite insig- THE PROBLEM : THE MODE OF ITS SOLUTION 15.
Pagina 20
... bird . But a glance at it shows that it is a mammal . It is covered with hair . It has fore and hind legs . Its wings ... birds . It differs from mammals only in its wings . But we re- member that flying squirrels have a membrane stretch ...
... bird . But a glance at it shows that it is a mammal . It is covered with hair . It has fore and hind legs . Its wings ... birds . It differs from mammals only in its wings . But we re- member that flying squirrels have a membrane stretch ...
Pagina 21
... birds and whales with fish . All animals , like coral animals and starfishes , whose similar parts were arranged in lines radiating from a centre , were united as radiates , how- ever much they might differ in internal structure and ...
... birds and whales with fish . All animals , like coral animals and starfishes , whose similar parts were arranged in lines radiating from a centre , were united as radiates , how- ever much they might differ in internal structure and ...
Pagina 22
... bird , the archeopteryx , had a long tail like that of a lizard , and teeth ; and thus stood in many respects almost midway between birds and rep- tiles . And most of the earliest forms were 66 compre- hensive , " uniting the ...
... bird , the archeopteryx , had a long tail like that of a lizard , and teeth ; and thus stood in many respects almost midway between birds and rep- tiles . And most of the earliest forms were 66 compre- hensive , " uniting the ...
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