. Carnegie Institution of Washington publication. 76 BACTERIA IN RELATION TO PLANT DISEASES. The writer lias no very satisfactory way of making exposures for determining the minimum temperature for growth. His method is to make such exposures in the bottom of a large, well-filled ice-box, which is opened as little as possible during the progress of the tests, and then only for the briefest periods. The degree of cold. Fig. 63.* is governed by the amount of ice. A good thermometer is exposed in the midst of a bundle of inoculated tubes, and if the temperature shows any tendency to rise more ice
. Carnegie Institution of Washington publication. 76 BACTERIA IN RELATION TO PLANT DISEASES. The writer lias no very satisfactory way of making exposures for determining the minimum temperature for growth. His method is to make such exposures in the bottom of a large, well-filled ice-box, which is opened as little as possible during the progress of the tests, and then only for the briefest periods. The degree of cold. Fig. 63.* is governed by the amount of ice. A good thermometer is exposed in the midst of a bundle of inoculated tubes, and if the temperature shows any tendency to rise more ice is added. Under the most favorable circumstances the temperature of the *Fic. 63.—Modification of the Ostwald water-bath used by the writer for thermal death-point experiments. This consists of a porcelain-lined pot n inches in diameter at the top. This is filled with water kept in motion by a water-wheel turned by electricity. The heat is applied by means of a Ki irdliurf; burm-r and is controlled by Roux's thermo-regulator. Murrill's gas-pressure regulator is shown at the 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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