Elementary Biology; An Introduction to the Science of Life

Elementary Biology; An Introduction to the Science of Life

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ...important substances, which are very useful in the hands of the expert but very dangerous in the hands of the ignorant. Morphin, which is the active substance in opium, is an alkaloid that was first separated from the poppy plant about a hundred years ago. In fact, this was the first alkaloid to be systematically studied. From a medical point of view morphin is the most useful of the alkaloids, but it stands next to cocain as a habit-forming drug, and, from the very fact of its extensive use in medicine, has ruined thousands of times as many victims as cocain has. In small doses it lowers the heart action, slows the breathing, deadens pain, and induces a dreamy, quiet feeling ending in sleep. It acts on the nerves that carry impulses from the brain, weakening the control of the muscles. In larger doses it causes the pupils of the eyes to contract until they are almost closed, and lowers the respiration dangerously near the stopping point; in fact, death by morphin is brought about by stopping the respiration. As with other drugs, there is a reaction later, in which the effects are to some extent reversed. It has been said that the widespread use of opium has been the greatest obstacle to the development and progress of the Chinese people. So degrading are the effects of the drug that in 1907 the Chinese government finally prohibited the raising of the poppy and the traffic in opium; and in 1918 the government of Tunis did the same, going so far as to order all wild and all cultivated poppy plants destroyed. While morphin has been most commonly administered by the smoking of opium, the habit of using it may be traced to its administration as medicine or by injection under the skin. Many drug-store preparations contain morphin, and it has been...show more

Product details

  • Paperback | 144 pages
  • 189 x 246 x 8mm | 268g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236645618
  • 9781236645616