. Kirkes' handbook of physiology . ror. Make a table showing the power of local dis-crimination in the different regions. 2. Aristotles Touch Experiment. Roll the tips of the middle andindex fingers over a marble and note that the sensation from the two fingersis interpreted as that of a single object. Now cross the fingers and repeatthe experiment. This time there is the sensation of touching two spheres. 3. Temperature Sensations. It is a common experience that thehand brought in the neighborhood of a warm or a cold object develops the 670 THE SENSES sensation of warmth or cold. Examine a gi
. Kirkes' handbook of physiology . ror. Make a table showing the power of local dis-crimination in the different regions. 2. Aristotles Touch Experiment. Roll the tips of the middle andindex fingers over a marble and note that the sensation from the two fingersis interpreted as that of a single object. Now cross the fingers and repeatthe experiment. This time there is the sensation of touching two spheres. 3. Temperature Sensations. It is a common experience that thehand brought in the neighborhood of a warm or a cold object develops the 670 THE SENSES sensation of warmth or cold. Examine a given small area of the back ofthe hand with the thermoesthesiometer. Certain points will give strongersensation of heat than others. Map these out carefully. Examine the samearea for the cold. A large number of cold spots will be found and thev willnot coincide with the warm spots, figure 421. The stimulation for the hot and cold spots does not depend upon theabsolute temperature, but on the relative temperature. Insert the hand in. Fig. 481.—Localization of Taste. Bitter ; acid ; salt, ; sweet ; T, tonsils; FC, foramen cecum; CF, circumvallate papillae; FP, fungiform papillae. (Hall.) water that feels lukewarm. Place the same hand in a cup of quite warm waterfor a moment, then reinsert it in the lukewarm water. This will now feel cold. 4. Sensations of Taste. The distribution of taste organs in thetongue is shown in figure 481. Examine your own tongue for organs ofsweet, acid, saline, and bitter, using solutions of 1 to 2 per cent salt, 10 percent sugar, 2 to 5 per cent acid, 5 per cent acetic acid, and per cent quinine. Wipe the tongue dry and apply the solution named from the tip of a glassrod. The best form of rod is about 15 cm. long by cm. in diameter, andhas one end drawn out to a slender pencil-shaped tip and of a size whichwill suspend a very small drop. Too large a drop diffuses over too great anarea of the tongue. Occasionally small crystals of sugar, salt,
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