. Carnegie Institution of Washington publication. REACTIONS TO HEAT AND COLD. I I in principle to that of Mendelssohn, but more easily constructed and permitting exact observation of the organisms with the microscope, though otherwise much less elegant than Mendelssohn's. This ap- paratus is shown in Fig. 5. It consists essentially of three glass tubes, of 8 millimeters bore, which are supported in a horizontal position, side by side, by passing them through auger holes in a block of wood. The tubes are one inch apart and are placed exactly at the same level, so that a glass slide rests equall
. Carnegie Institution of Washington publication. REACTIONS TO HEAT AND COLD. I I in principle to that of Mendelssohn, but more easily constructed and permitting exact observation of the organisms with the microscope, though otherwise much less elegant than Mendelssohn's. This ap- paratus is shown in Fig. 5. It consists essentially of three glass tubes, of 8 millimeters bore, which are supported in a horizontal position, side by side, by passing them through auger holes in a block of wood. The tubes are one inch apart and are placed exactly at the same level, so that a glass slide rests equally on all three. To the two ends of each of these rubber tubes are attached. The rubber tubes from one end pass upward into vessels of water raised on a shelt above the level of the apparatus. From the other end the rubber tubes. FIG. 5.* pass downward into a waste pail, thus acting as overflow tubes. A trough, or slide (5), containing infusoria, is placed on the three glass tubes ; the water in the vessels on the shelf is heated or cooled to any desired temperature, and is then siphoned off and allowed to flow downward through the glass tubes. The rate of flow is controlled by pinchpocks. In this manner heated water can be caused to flow beneath one end of the slide, cold water beneath the other. The slide being thus unequally warmed, the reactions of the organisms can be observed. The rubber tubes leading from the hot and cold vessels can be interchanged, so that the temperature at either end or the middle of the slide can be at once changed and made high or low, without the * FIG. 5.—Apparatus used for testing reaction to heat and cold. scription, see text. For de-. 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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