. Laboratory work in bacteriology. Bacteriology. 539 BACTERIOLOGY. dows are securely caulked with strips of cloth, or better with putty. The usual time of exposure is 20 hours. The formaldehyde experiments may be carried out, either by sprinkling large sheets of muslin or filter-paper with the necessary amount of the 40 per cent, solution and then hanging these up in the room, or by distilling the for- maldehyde into the room through a tube inserted into the key-hole. The author's apparatus' shown in Fig. 76 has been especially designed for practical room disinfec- tion. The copper vessel can
. Laboratory work in bacteriology. Bacteriology. 539 BACTERIOLOGY. dows are securely caulked with strips of cloth, or better with putty. The usual time of exposure is 20 hours. The formaldehyde experiments may be carried out, either by sprinkling large sheets of muslin or filter-paper with the necessary amount of the 40 per cent, solution and then hanging these up in the room, or by distilling the for- maldehyde into the room through a tube inserted into the key-hole. The author's apparatus' shown in Fig. 76 has been especially designed for practical room disinfec- tion. The copper vessel can be heated with a Bunsen burn- er or with a Primus kerosene lamp. 150 of the 40 per cent, formaldehyde solution are used for each 1,000 cu. ft. of air space. Fig. 76. The author's formaldehyde ap- m. i j. • i paratus for room disinfection. a^Narrow The bactenal SUSpeUSlOUS tube, to be inserted in key-hole; *—Funnel . tube provided with solid stopper; c—Reset- are prepared accordmg to the voir; d—Kerosene burner. directions given on p. 514; and sterile silk-threads, muslin squares and cover-glasses are then infected. The action of the disinfectant should be studied, at the same time, on moist and on dry specimens. The moist specimens can be kept in this condition, for hours if need be, by placing them over water in a large moist- chamber. The dried specimens are obtained by placing the freshly prepared set in an incubator at 39° for 2-3 hours, the cover of the dish being slightly ajar. When the specimens have become dry they should be loosened from the bottom by means of sterile forceps. 'Teacher's Sanitary Bulletin, No. 3, Michig^an State Board of Health; Medical News, May, 1898, p. 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
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