An Introduction to General BiologyH. Holt, 1895 - 231 páginas |
Otras ediciones - Ver todas
An Introduction to General Biology William Thompson Sedgwick,Edmund Beecher Wilson Vista completa - 1895 |
An Introduction to General Biology William Thompson Sedgwick,Edmund Beecher Wilson Vista completa - 1895 |
An Introduction to General Biology William Thompson Sedgwick,Edmund Beecher Wilson Vista completa - 1899 |
Términos y frases comunes
action agamogenesis alimentary canal Amaba antheridium apical buds appears archegonium archenteron bacteria become Biology blastula blood blood-vessels body body-wall branches bundles carbon dioxide cavity cells chemical chlorophyll cilia cœlom cœlomic consists contains contractile differentiation digestion dissepiment division dorsal vessel earthworm ectoblast efferent elongated embryo energy environment epidermis excretion fern fibres fibro-vascular fission fluid free oxygen function fundamental ganglia gastrulation germ-cells germ-layers give rise higher animals individual Infusoria known later layer leaf lifeless matter living matter living things longitudinal Lumbricus macronucleus mass membrane mesoblast metamerism microscope mouth muscles muscular nephridia nephridium nerve-cord nerves nucleus organs outer ovary ovum parenchyma pass pharynx physiological portion posterior proteids prothallium Protococcus protoplasm Pteris reproduction rhizome sclerotic setæ showing shown side skin somite species spermatozoa spores starch stomach-intestine structure sub-intestinal substance surface tion tissues tube unicellular vacuole vegetal ventral Vorticella walls worm yeast
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Página 34 - C.) produce also the death of most organisms. "Amongst the organic proximate principles which enter into the composition of the tissues and organs of living beings, those belonging to the class of proteid or albuminous bodies occupy quite a peculiar place and require an exceptional treatment, for they alone are never absent from the active living cells which we recognize as the primordial structures of animal and vegetable organisms. In the plant, whilst we recognize the wide distribution of such...
Página 231 - Guide to the Study of Insects, and a Treatise on those Injurious and Beneficial to Crops.
Página 4 - The increase of size which constitutes growth is the result of a process of molecular inter-susception, and therefore differs altogether from the process of growth by accretion.
Página iii - We have sought to lead beginners in biology from familiar facts to a better knowledge of how living things are built and how they act, such as may rightly take place in general education, or may afford a basis for further studies in general biology, zoology, botany, physiology, or medicine.
Página 2 - ... expelled in new combinations. " The parallel between a whirlpool in a stream and a living being, which has often been drawn, is as just as it is striking. The whirlpool is permanent, but the particles of water which constitute it are incessantly changing. Those which enter it on the one side are whirled around and temporarily constitute a part of its individuality; as they leave it on the other side, their places are made good by new comers.
Página 2 - ... a stationary hillock of water. Viewed closely, it is a typical expression of the conflicting impulses generated by a swift rush of material particles. Now, with all our appliances, we cannot get within a good many miles, so to speak, of the crayfish. If we could, we should see that it was nothing but the constant form of a similar turmoil of material molecules which are constantly flowing into the animal on the one side, and streaming out on the other.
Página 221 - ... light, filter, and add 25 cc of glycerine and 25 cc of methyl alcohol.
Página 4 - But the increase of size which constitutes growth is the result of a process of molecular intus-susception, and therefore differs altogether from the process of growth by accretion, which may be observed in crystals and is effected purely by the external addition of new matter — so that, in the well-known aphorism of Linnaeus,* the word " grow," as applied to stones, signifies a totally different process from what is called " growth