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adaptation adaptive radiation adult Africa amphibia ancestral animals aquatic aquatic adaptation arboreal become birds body bones camel carnivorous cave cells Chapter characteristic characters claws color comparable creatures Cretaceous cursorial Darwin desert developed digits dinosaurs elephant elongated entirely Eocene epigean evolution evolutionary existence extinct fauna feet female fins fishes flight flying foot fore limbs forms fossil fossorial genera genus geologic gills habitat hand hence hind limbs horse ichthyosaurs increase insects instance Jurassic known larvae later length living lizards lower male mammalian mammals marine marsupials mastodon Mesozoic Miocene modification molars muscles Museum natural selection North America notochord Oligocene organs origin Osborn pair parasitic patagium Permian plants Pleistocene Pliocene primitive proboscidean protoplasm race relatively reptiles shell skeleton skull Smilodon species speed structure surface tail teeth terrestrial tion tooth Triassic true tusks types ungulates upper variation vertebrates whales wings
Page 149 - And he set the rods which he had pilled before the flocks in the gutters in the watering troughs when the flocks came to drink, that they should conceive when they came to drink.
Page 109 - Near villages and small towns I have found the nests of humblebees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
Page 10 - Lamarck (1744-1829) was one of the most remarkable as well as one of the most pathetic figures in evolutionary history.
Page 9 - ... all animals undergo perpetual transformations; which are in part produced by their own exertions in consequence of their desires and aversions, of their pleasures and their pains, or of irritations, or of associations; and many of these acquired forms or propensities are transmitted to their posterity.
Page 279 - The solution, as I believe, is that the modified offspring of all dominant and increasing forms tend to become adapted to many and highly diversified places in the economy of nature.
Page 27 - ... of California, towering to the dimensions of a cathedral spire, or the Indian fig, which covers acres with its profound shadow, and endures while nations and empires come and go around its vast circumference. Or, turning to the other half of the world of life, picture to...
Page 16 - The world has been evolved, not created; it has arisen little by little from a small beginning, and has increased through the activity of the elemental forces embodied in itself, and so has rather grown than suddenly come into being at an almighty word. What a sublime idea of the infinite might of the great Architect! the Cause of all causes, the Father of all fathers, the Ens entium! For if we could compare the Infinite it would surely require a greater Infinite to cause the causes of effects than...
Page 659 - Perhaps no order of mammals presents us with so extraordinary a series of gradations as this— leading us insensibly from the crown and summit of the animal creation down to creatures, from which there is but a step, as it seems, to the lowest, smallest, and least intelligent of the placcntal Mammalia.
Page 348 - I believe that albatrosses move their wings much oftener than is suspected. They often have the appearance of soaring for long periods after a ship without flapping their wings at all, but if they be very closely watched, very short but extremely quick motions of the wings may be detected. The appearance is rather as if the body of the bird dropped a very short distance and rose again. The movements cannot be seen at all unless the bird is exactly on a level with the eye. A very quick stroke, carried...