Evolution and Animal Life: An Elementary Discussion of Facts, Processes, Laws and Theories Relating to the Life and Evolution of AnimalsD. Appleton, 1907 - Всего страниц: 489 |
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Стр. 155
... fertilized eggs ) , we find that this is true . The organs examined for variation in these series of bees were the wings , organs used by both drones and workers , and having no immedi- ate relation either structurally or ...
... fertilized eggs ) , we find that this is true . The organs examined for variation in these series of bees were the wings , organs used by both drones and workers , and having no immedi- ate relation either structurally or ...
Стр. 157
... fertilized seeds . At first only a few specimens were found , each form in a particular part of the field , which looks as though each might have come from the seeds of a single plant . " These two new forms , as well as the common O ...
... fertilized seeds . At first only a few specimens were found , each form in a particular part of the field , which looks as though each might have come from the seeds of a single plant . " These two new forms , as well as the common O ...
Стр. 158
... fertilized plants of the lamarckiana form , so that the new plants ap- pearing in each horizontal line are the descendants in each generation of lamarckiana parents . It will be observed that the species , O. ob- longata , appeared ...
... fertilized plants of the lamarckiana form , so that the new plants ap- pearing in each horizontal line are the descendants in each generation of lamarckiana parents . It will be observed that the species , O. ob- longata , appeared ...
Стр. 159
... fertilized , its seeds pro- FIG . 97. At left , section of chestnut , Castanea vesca , showing unusual variations ; at right , a branch of Mercurialis annua , which presents several variations . ( After de Vries . ) duce always three ...
... fertilized , its seeds pro- FIG . 97. At left , section of chestnut , Castanea vesca , showing unusual variations ; at right , a branch of Mercurialis annua , which presents several variations . ( After de Vries . ) duce always three ...
Стр. 160
... fertilized with pollen from other species . Here also ap- peared some of the new species , already mentioned , namely , al- bida , nannella , lata , oblongata , ru- brinervis , and also two new species , elliptica and subovata . " De ...
... fertilized with pollen from other species . Here also ap- peared some of the new species , already mentioned , namely , al- bida , nannella , lata , oblongata , ru- brinervis , and also two new species , elliptica and subovata . " De ...
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actual adaptation adult animals and plants ants appear artificial selection become bees beetles biologists birds body breeding Burbank butterfly called causes centrosome changes characters chromatin chromosomes color and pattern common crab Darwin degeneration degree division egg cell embryo environment evolution existence fact factors fauna feeding female fertilized fishes forms fossils gastrula genus germ cells habit hatched heredity honeybee host hybrid individuals influence inheritance insects instinct islands isolation kinds of animals larva larvæ legs live lower male mammals ment modified mutations natural selection naturalists nest nucleus offspring organs Origin of Species original parasites parent phenomena plasm produced protoplasm Protozoa rabbit race relation reproduction resemblance rocks Sacculina sea anemone sexual sexual selection sheep simple species species-forming sperm spines stage structure tail tetrads theory tion traits tree variation various vertebrates Vries Weismann wings workers worm young
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Стр. 466 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Стр. 424 - ... duty of each and all of us is to try to make the little corner he can influence somewhat less miserable and somewhat less ignorant than it was before he entered it. To do this effectually it is necessary to be fully possessed of only two beliefs: the first, that the order of nature is ascertainable by our faculties to an extent which is practically unlimited; the second, that our volition counts for something as a condition of the course of events.
Стр. 23 - ... x's and y's with which he works his problems, for real entities — and with this further disadvantage, as compared with the mathematician, that the blunders of the latter are of no practical consequence, while the errors of systematic materialism may paralyse the energies and destroy the beauty of a life.
Стр. 466 - To my mind it accords better with what we know of the laws impressed on matter by the Creator, that the production and extinction of the past and present inhabitants of the world should have been due to secondary causes, like those determining the birth and death of the individual.
Стр. 424 - We live in a world which is full of misery and ignorance, and the plain duty of each and all of us is to try to make the little corner he can influence somewhat less miserable and somewhat less ignorant than it was before he entered it.
Стр. 61 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
Стр. 135 - Our ignorance of the laws of variation is profound. Not in one case out of a hundred can we pretend to assign any reason why this or that part has varied.
Стр. 455 - Thus, whatever system of organs be studied, the comparison of their modifications in the ape series leads to one and the same result — that the structural differences which separate man from the gorilla and the chimpanzee are not so great as those which separate the gorilla from the lower apes.
Стр. 118 - Given any species in any region, the nearest related species is not likely to be found in the same region, nor in a remote region, but in a neighboring district, separated from the first by a barrier of some sort, or at least by a belt of country the breadth of which gives the effect of a barrier.