. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 230 INFECTION AND IMMUNITY individual microorganisms become more and more scarce, finally leaving the medium between clumps entirely clear. While the clumping of a motile organism suggests that motility has something to do with the coming together in clumps, it nevertheless has no relation whatever to agglutination, motile and non-motile organisms alike being subject to the reaction. Macroscopically observed, in small test tubes or capillary tubes, ag- glutination evidences itself by t
. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 230 INFECTION AND IMMUNITY individual microorganisms become more and more scarce, finally leaving the medium between clumps entirely clear. While the clumping of a motile organism suggests that motility has something to do with the coming together in clumps, it nevertheless has no relation whatever to agglutination, motile and non-motile organisms alike being subject to the reaction. Macroscopically observed, in small test tubes or capillary tubes, ag- glutination evidences itself by the formation of flake-like masses which. Fig. 60.—Macroscopic Agglutination. Dilutions from 1 in 10 to 1 in 1,000. The first tube contains a 1 : 20 control with the bacteria and normal serum. Agglntination complete in the tubes marked 10, 20, 50, 100. settle into irregular heaps at the bottom, leaving the supernatant fluid clear, in distinct contrast to the even flat sediment and the clouded supernatant fluid of the control. Macroscopically, too, agglutination is evidenced when bacteria are grown in broth to which immune serum has been added. Instead of evenly clouding the broth, the micro- organisms develop in clumps or chains. Another phenomenon probably produced by agglutinins is the so-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hiss, Philip Hanson, 1868-1913; Zinsser, Hans, 1878-1940. joint author. New York and London, D. Appleton and Company
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