First lines of physiology : designed for the use of students of medicine / by Daniel Oliver.

  • Daniel Oliver
Date:
1835
Catalogue details

Licence: Public Domain Mark

Credit: First lines of physiology : designed for the use of students of medicine / by Daniel Oliver. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    1. Some have the property of shining in the dark, after having been exposed to solar or other light for a certain time. This is the case with the diamond, calcareous spar, marble, strontian, and some other bodies; and in a less degree, with alabaster, salt-petre, muriate of ammonia, galena, &c. The phosphor- escence takes place in all transparent media, and even in a vacuum, with a sensible evolution of heat. 2. Many substances shine in the dark, after having been exposed to a certain heat, as chalk, barytes, strontian, magnesia, rock crystal, quartz, topaz ;, the filings of many metals, as zinc, antimony, iron, silver, and gold. In these cases heat appears to act by over- coming the affinity of these bodies for light, and set- ting this element free. 3. Friction, percussion and compression, are accom- panied with a disengagement of light in many sub- stances, particularly in those, which are rendered phos- phorescent by insolation or exposure to heat. Certain fluids, as water and air, give out light, when suddenly compressed. 4. The crystallization of salts, in the water in which they were dissolved, is sometimes accompanied with a disengagement of light. This has been particularly observed in the sulphate of ])otash, and the filiate of soda. 5. Intense chemical action is generally accompanied with an evolution of light. 6. Electrical phenomena frequently give rise to a dis- engagement of light. Some bodies are rendered lumin- ous by the transmission of an electric shock through them; and the fluid itself frequently becomes visible, under the form of a vivid spark. Many organic substances destitute of life, give out light under circumstances exactly similar; 1. some, after exposure to solar light, as flour, starch, gum ara- bic, feathers, horn, coral, snail shells, teeth, pearls, bones, &c.; 2. some after exposure to heat, as volatile and fixed oils, sugar, wood, &c.; 3. some, by friction, as sugar, manna, resins, &c.: olive and essential oils, when shaken in a vacuum; 4. all organic bodies
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