. Laboratory work in bacteriology. Bacteriology. THE HANGING-DEOP. 141 structive distillation; the cover-glasses are, as a result, per- fectly clean, and they remain thus, as long' as they are kept in the covered dish. It is advisable to clean up a box of cover-glasses at a time. The Presenius iron drying plate, with its six cups, is especially convenient for student's use. The temperature of this plate can easily be raised to 200°. Only very rarely, will this procedure for obtaining clean cover-glasses, fail. In such cases, an additional passage of the cover-glass, two or three times, through
. Laboratory work in bacteriology. Bacteriology. THE HANGING-DEOP. 141 structive distillation; the cover-glasses are, as a result, per- fectly clean, and they remain thus, as long' as they are kept in the covered dish. It is advisable to clean up a box of cover-glasses at a time. The Presenius iron drying plate, with its six cups, is especially convenient for student's use. The temperature of this plate can easily be raised to 200°. Only very rarely, will this procedure for obtaining clean cover-glasses, fail. In such cases, an additional passage of the cover-glass, two or three times, through the flame, will give a suitable surface. The droplet of water, or the bacterial suspension, should be placed on that side of the cover-glass which touched the flame. The cover-glass should always be handled with a pair of forceps. The ordinary, slender, narrow-pointed forceps, are well adapted for this purpose. In staining, however, they have one serious disadvantage. The weak blades compress on the slightest pressure, and form a capillary along which the staining reagent readily drains from the cover-glass. Under these conditions, the hands of the stu- dent stain more readily than does the Fig. 20. Cover-glass forceps of the author, a—Simple form; b—Forceps provided with clasp. , The forceps devised by the author, and shown in Fig. 20, are extremely convenient in handling cover-glasses. The lower blade is flat and has a broad end (2 mm. wide), with a thin, sharp edge. The upper blade is narrow, bent, and terminates in a point, which, when the forceps are shut, rests close to the end of the lower blade. The advantages pos- sessed by these forceps are, that it enables one to pick up. 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 Novy, Frederick George, 1864- . Ann Arbor [Mich. ] G. Wahr
Size: 2771px × 902px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherannarbormichgwahr
