. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 642 PATHOGENIC MICROORGANISMS another, owing to the fact that selective cultivation has succeeded in altering many of the characteristics displayed by many of the strains. The same observer recommends the following method for obtaining pure cultures of this microorganism. As much of the material as can be conveniently obtained is gently rubbed up in a sterile mortar with fine sand or infusorial earth. The triturated material is then inoculated into fluid agar and plates are poured. Ord
. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 642 PATHOGENIC MICROORGANISMS another, owing to the fact that selective cultivation has succeeded in altering many of the characteristics displayed by many of the strains. The same observer recommends the following method for obtaining pure cultures of this microorganism. As much of the material as can be conveniently obtained is gently rubbed up in a sterile mortar with fine sand or infusorial earth. The triturated material is then inoculated into fluid agar and plates are poured. Ordinary streaked plates upon agar may also be used with success with material directly from the centers of scutula. The achorion grows best upon acid agar at a temperature of ° Fig. 161.—Thrush. Oidium albicans, unstained. (After Zettnow.) Growth appears within from forty-eight hours to three days as yellowish disks, which occasionally may be sUghtly furred with aerial hypha. Ringworm (Trichophyton tonsurans).—Ringworm, Tinea circinata, or Herpes tonsurans, is a contagious disease of the skin and hair, occur- ring most often in children and appearing upon both the haired portions of the body, as well as upon free skin. It is characterized by the forma- tion of circular scaly patches, within which the hairs fall out. The disease is caused by several species of the trichophyton, a genus of hyphomycetes. These microorganisms were first recognized as inci- tants of the disease by Gruby^ in 1841, and were most thoroughly • Grvby, Comptes rend, de I'acad. des soi., 13, 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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