Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . wth.—Somewhat more rapid than the favus, and thegelatin quickly liquefied. Old cultures are of an orange-yeUow color. Colonies have a star-shaped form. On agar and potato the organism can be cultivated byfirst treating the infected hairs and scales with potassiumhydroxid (dilute solution); this liberates the spores and dis-solves sorne of the bacteria which usually contaminates theculture. Some of the colonies are crateriform. Pathogenesis.—Herpes tonsurans and the vari
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . wth.—Somewhat more rapid than the favus, and thegelatin quickly liquefied. Old cultures are of an orange-yeUow color. Colonies have a star-shaped form. On agar and potato the organism can be cultivated byfirst treating the infected hairs and scales with potassiumhydroxid (dilute solution); this liberates the spores and dis-solves sorne of the bacteria which usually contaminates theculture. Some of the colonies are crateriform. Pathogenesis.—Herpes tonsurans and the various tineas areproduced by this 226 ESSENTIALS OF BACTERIOLOGY Microsporon Furfur.—Found in tinea or pityriasis versi-color, almost identical with the above; forms dry yellowspots, usually on the chest, in persons suffering from wastingdiseases. Aspergillus Glaucus.—The aspergUlus is a commonmoid contaminating bacterial cultures. Origin.—In saccharine fruits. Form.—^The hypha has formed upon its further end a bulb,from which pear-shaped sterigmata arise and bear upon theirends the conidia or Fig. III.—Aspergillus fumigatus (X 500) (Frankel and Pfeiffer). Growth.—^Best upon fruit-juices. Non-pathogenic. Themold is green. Aspergillus flavus has the tufts and spores ofa yellow color. Aspergillus Fumigatus.—Is pathogenic for rabbits wheninjected into them. At the autopsy their visceraare foundfilled with the mold. Examination of Yeasts and Molds.—^Yeasts and moldsare best examined in the unstained condition. A small por-tion of the colony rubbed up with a mixture of alcohol and a YEASTS AND MOLDS 227 few drops of liquor ammonia; of this, a little is brought uponthe glass slide, covered with a drop of glycerin, and the cover-glass pressed upon it. If the preparation is to be saved, thecover-glass is secured by ringing around the edges withvarnish or cement. Yeasts take methylene-blue stain verywell. Cladothrices and Streptothrices.—The strept
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