. A practical treatise on medical diagnosis for students and physicians . the bronchi, or thelarynx or bloodvessels, the presence of elastic fibres from food remainingin the mouth must be especially guarded against. Elastic fibres may bemistaken for fat-crystals. They are found as single threads in bundles,or they may show an alveolar arrangement. They are to be recognizedby the double contour and the curling ends, and at times by their alveolararrangement. They may be due to tuberculosis, abscess of the lung,bronchiectasis, gangrene of the lung, pneumonia (von Jaksch), and rarelyto destructiv
. A practical treatise on medical diagnosis for students and physicians . the bronchi, or thelarynx or bloodvessels, the presence of elastic fibres from food remainingin the mouth must be especially guarded against. Elastic fibres may bemistaken for fat-crystals. They are found as single threads in bundles,or they may show an alveolar arrangement. They are to be recognizedby the double contour and the curling ends, and at times by their alveolararrangement. They may be due to tuberculosis, abscess of the lung,bronchiectasis, gangrene of the lung, pneumonia (von Jaksch), and rarelyto destructive diseases of the larynx. In a very great majority of casesthey are due to tuberculosis. It is uncommon to find them in gangrene,probably because, as Traube first suggested, they are destroyed by a fer-ment. (See Fig. 216.) Elastic tissue from the alveoli often shows the diagnostic alveolararrangement: the fibres that form a bronchus are branched ; those froman eroded artery appear in the form of a network; or the fibres may bebound together. (See Fig. 217.) Fig. Elastic fibres of lung tissue obtained from sputa after digestion in caustic soda.(Drawn by Dr. John Wilson.) Detection of Elastic Fibres, The method employed by Osier, modifiedfrom Sir Andrew Clarks, is the best. A small amount of thick, purulentportions of sputum is pressed out in a thin layer between two pieces ofplain window-glass, 15X15 cm. and 10 X10 cm. The particles of elastictissue appear on a black background as grayish-yellow spots, and can beexamined in situ under a low power. Or the upper piece of glass may FIBBINOUS COAGULA. 615 be ^lid olf till the piece of tissue is uncovered, when it is picked out andexamined on a microscope-slide, first with a low power, such as the 1-or l^-inch objective, and then with a higher power. At first therewill be some difficulty in distinguishing with the naked eye betweenelastic fibres and particles of bread or milk-globules, or collections ofepithelium and debris, b
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