An Introduction to the Study of the Comparative Anatomy of Animals
The book An Introduction to the Study of the Comparative Anatomy of Animals was written by author Bourne, Gilbert Charles, 1861- Here you can read free online of An Introduction to the Study of the Comparative Anatomy of Animals book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Introduction to the Study of the Comparative Anatomy of Animals a good or bad book?
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Protoplasm, the material basis of life, was first discovered by Dujardin, who called it sarcode. Dujardin stated precisely what he meant by sarcode. "It is that," he said, "which, other observers have called a living jelly — that gelatinous, diaphanous structure, insoluble in water, which contracts into globular masses, attaches itself to one's dissecting needles, and can be drawn out in strings like mucus." Further than this, Dujardin, recognised that sarcode must be organised, must possess a ...structure. Not that he was able, with the imperfect microscopes of the day, to ob- serve and describe a structure, but he felt bound to postu- late one, because of the vital activity of the substance. " Sar- code is without visible organs, and without the appearance Digitized by Microsoft® 78 COMPARATIVE ANATOMY of cellulosity, but it is nevertheless organised, since it emits diverse prolongations carrying granules with them, extending and retracting themselves alternately — in a word, it has life." The word " protoplasm " is due to a botanist, Hugo von Mohl, who, in 1846, described the constitution of the so-called primordial utricle in plant cells — a semi-fluid, gelatinoid, living substance, similar to the sarcode already described by Dujardin.
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