The Physiology of the InvertebrataL. Reeve, 1892 - Всего страниц: 447 |
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abdomen albumin alcohol alimentary canal animals Annelida antennæ aperture apparatus appendages Astacus auditory band blood body branchiæ cæca calcium carbonate of lime carbonic anhydride cerebral ganglion Cestoidea chitinous chlorophyll ciliated colouring matter consists contains corpuscles Crustacea developed digestive dorsal ducts Echinodermata Echinus ectoderm embryo excretion external eyes female fluid function ganglia ganglion genital organs give rise glandular hæmoglobin hermaphrodites histohæmatins Homarus insects integument intestine Invertebrata Invertebrates large number larva larvæ layer lipochromes locomotion Lumbricus MacMunn male Malpighian tubules Medusa membrane Microscopical Mollusca mouth murexide muscles muscular Myriapoda nephridia nephridium nerve-fibres nerves nervous system ocular spots ovary oviduct ovum oxygen pair passes pharynx phosphate physiological pigment Porifera portion posterior present protoplasm Protozoa renal organs respiration respiratory salivary glands secretion shell situated so-called liver solution species spectrum spermatozoa stomach substance surface tentacula terminate tion tissues tubes urea uric acid ventral vessels yellow cells
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Стр. 399 - But expectation is permissible where belief is not; and, if it were given me to look beyond the abyss of geologically recorded time to the still more remote period when the earth was passing through physical and chemical conditions which it can no more see again than a man can recall his infancy, I should expect to be a witness of the evolution of living protoplasm from not living matter.
Стр. 391 - ... good; silently and insensibly working, whenever and wherever opportunity offers, at the improvement of each organic being in relation to its organic and inorganic conditions of life. We see nothing of these slow changes in progress, until the hand of time has marked the long...
Стр. 399 - With organic chemistry, molecular physics, and physiology yet in their infancy, and every day making prodigious strides, I think it would be the height of presumption for any man to say that the conditions under which matter assumes the properties we call " vital " may not, some day, be artificially brought together.
Стр. 391 - It may metaphorically be said that natural selection is daily and hourly scrutinising, throughout the world, every variation, even the slightest ; rejecting that which is bad, preserving and adding up all that is good ; silently and insensibly working, whenever and wherever opportunity offers, at the improvement of each organic being in relation to its organic and inorganic conditions of life.