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action active adult Amphibians animals ants become begin Biology birds body brain buds called carbonic carbonic acid Chambers's changes characteristic ciliated colony colour complex corals crab creatures crustaceans cuttlefish Darwin division of labour earth Echinoderms egg-cell eggs embryo energy Erasmus Darwin evolution Evolution of Sex fact female fertilised fishes food-canal freshwater frog function grow habit Haeckel heredity higher animals hydroid illustration individual influence Infusorians insects instincts jellyfish kinds lancelet larvae less living matter Lond males mammals mates medusoids molluscs Natural History natural selection naturalists nervous nest notochord observed offspring organism origin ovum parasites parents plants Prof progress Protists protoplasm Protozoa realised recognise regard reproductive cells reptiles result Rotifers sea-anemones seems shells simplest animals skin sometimes species spermatozoa spiders sponges strange structure struggle for existence substances suggest surroundings theory tion tissues units variations Vertebrate Weismann worms young Zoea zoology
Page 339 - THERE was a child went forth every day, And the first object he look'd upon, that object he became, And that object became part of him for the day or a certain part of the day, Or for many years or stretching cycles of years.
Page 297 - Doing this, and making the requisite addition, the formula finally stands thus :—Evolution is an integration of matter and concomitant dissipation of motion; during which the matter passes from an indefinite, incoherent homogeneity to a definite, coherent heterogeneity ; and during which the retained motion undergoes a parallel transformation.
Page 44 - When we reflect on this struggle, we may console ourselves with the full belief, that the war of nature is not incessant, that no fear is felt, that death is generally prompt, and that the vigorous, the healthy, and the happy survive and multiply.
Page 262 - It scarcely breathes with its one lung (the other shrivelled and abortive) ; it is passive to the sun and shade, and is cold or hot like a stone ; yet " it can outclimb the monkey, outswim the fish, outleap the zebra, outwrestle the athlete, and crush the tiger.
Page 289 - Fifthly, from their first rudiment, or primordium, to the termination of their lives, 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 pains, or of irritations, or of associations; and many of these acquired forms or propensities are transmitted to their posterity.
Page 33 - I should premise that I use the term Struggle for Existence in a large and metaphorical sense, including dependence of one being on another, and including (which is more important) not only the life of the individual, but success in leaving progeny.
Page 24 - It may be doubted whether there are many other animals which have played so important a part in the history of the world, as have these lowly organized creatures.
Page 23 - Earth-worms, though in appearance a small and despicable link in the chain of Nature, yet, if lost, would make a lamentable chasm.