. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. I04 BACTERIA IN RELATION TO PLANT DISEASES. Wlien ready to make the transfers or to pour the plates, close the windows, wipe up the tables, and wet down the floor, window-sashes, etc., with distilled water or boiled water, and reduce the air-currents within the laboratory to a mininiuni (especially when transfers are to be made in the open room) by keeping the doors shut and restrictiug the movements of all persons who may be in the room. It is much better to do all of this work in specially constructed small rooms (plate
. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. I04 BACTERIA IN RELATION TO PLANT DISEASES. Wlien ready to make the transfers or to pour the plates, close the windows, wipe up the tables, and wet down the floor, window-sashes, etc., with distilled water or boiled water, and reduce the air-currents within the laboratory to a mininiuni (especially when transfers are to be made in the open room) by keeping the doors shut and restrictiug the movements of all persons who may be in the room. It is much better to do all of this work in specially constructed small rooms (plate ii) than under hoods (plate 12). Hoods are open only in front. They maybe made of any convenient size. The one here figured is is 32 by 39 by 205^ inches, outside measurements. When one is far from laboratories small hoods may be extempor- ized out of clean paper, or cultures may be poured and transfers made inside of a clean pail or jar, turned down on its side. Any method, in fact, which restricts the mo\'ement of air past open plates and tubes will be found serviceable. The work-shelf of the room shown in plate 11 faces a window as wide as the room, and extending from the level of the shelf to the height of the other windows in the room. This window faces south and is only 6 feet from a well-lighted win- dow in the outer wall of the building. The room also receives bright light from the west side. At the front end of the shelf are a Bunsen burner with cut-off flame, a : box of safety matches, a box of rubber bands, and two tumblersâone for burned matches and one for platinxim loops, needles, forceps, etc. Immediately under this part is a narrow drawer for pencils, note paper, knives, etc. At the back end are a few wrapped Petri dishes, a nivella- tion apparatus, a flask of sterile water, and a crate of media. Underneath this part is a second shelf 3 inches Ijelovv the first, where Petri dishes and tubes containing solid media may be put out of the light as fast as inoculate
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