. The elements of pathological histology with special reference to practical methods . rmoregulator. When heated by gas,a gas-pressure regulator is also necessary. Owing to the fact that agar forces out water in solidifying, not onlymay the colonies float off, but even a slipping aw^ay of the entirelayer of agar may be caused. To avoid this as far as possible, theblotting-paper covering the bottom of the bell-glass should be butslightly moist, and over the uppermost culture-plate another emptyplate should be adjusted, upon which the evaporating water canthen condense. An alternative method is
. The elements of pathological histology with special reference to practical methods . rmoregulator. When heated by gas,a gas-pressure regulator is also necessary. Owing to the fact that agar forces out water in solidifying, not onlymay the colonies float off, but even a slipping aw^ay of the entirelayer of agar may be caused. To avoid this as far as possible, theblotting-paper covering the bottom of the bell-glass should be butslightly moist, and over the uppermost culture-plate another emptyplate should be adjusted, upon which the evaporating water canthen condense. An alternative method is to use what are known asPetris ca,psides (Fig. 10) for pouring into, instead of plates. The colonies on agar plates are far less distinctive than those ongelatin plates, and the same is true also of test-tube cultures on agar,and of cultures in bouillon, whereas the potato cultures, again, oftenshow exceedingly important characteristics. ROLL CULTURES 43 As culture plates prepared by the method just described are liableto be contaminated by aerial germs during examination, modes of. Fig. 9.—Thermostat, a, Thernioregulator; 6, Thermometer; c, Kochs burner. meeting this difficulty have been sought for. Such are the roll-Utbeof Esmarch, and the culture-Jlask of Lipez.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
