. Applied bacteriology; an introductory handbook for the use of students, medical officers of health, analysts and sanitarians. Bacteriology. 298 APPLIED BACTERIOLOGY Tricopliytoii Tonsurans. This fungus, which is the cause of herpes tonsurans, ringworm, onychomycosis, and certain other affections, was first described by Malsten, a Swedish microscopist, and about the same time by Gruby. The organism, which belongs to the oidium group, was first cultivated by Leslie Roberts, who obtained growths in broth to which malt extract and sugar had been added, growth occurring in twenty-four hours. A pu
. Applied bacteriology; an introductory handbook for the use of students, medical officers of health, analysts and sanitarians. Bacteriology. 298 APPLIED BACTERIOLOGY Tricopliytoii Tonsurans. This fungus, which is the cause of herpes tonsurans, ringworm, onychomycosis, and certain other affections, was first described by Malsten, a Swedish microscopist, and about the same time by Gruby. The organism, which belongs to the oidium group, was first cultivated by Leslie Roberts, who obtained growths in broth to which malt extract and sugar had been added, growth occurring in twenty-four hours. A pure culture. Fig. 25.—Trichophyton Tonsurans. (Mycelia and segmented filaments.) may be obtained from an affected hair by making, an agar plate and incubating it for three days at blood-heat, when the colonies will make their appearance as whitish spots. When grown on gelatine, the medium is liquefied. To diagnose a case of ringworm, it is generally sufficient to examine one of the suspected hairs under a low power (a quarter-inch), when it will be found to be covered with spores. To facilitate examination, the hair may first be soaked in 40'0 per cent, caustic potash, and then in alcohol and ether. If the patch itself is examined, spores will be found on the surface, while a little below will be seen a matted mass of mycelial branching. The organism may. 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 Pearmain, Thomas Hames; Moor, Cresacre George. London, Baillie?re, Tindall and Cox
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