Memoirs of the National Academy of Sciences . s. The accuracy of is measured with blows of varying force-(Webers law) and the correlation of velocity, mass aud area determined (e. g., is the sensation the same when theivelocity is 1 and the mass 2 as when the mass is 1 and tlie velocity 2). MEMOii;a UF THE ^ATIO^^AL ACADEMY OF SCIENCES. 413 done and tlie part sn|ipnrted by siinjilc, devices. Tims tlie arm was placed comfortably in a paddedwooden box and tlie base of the liamiiicr could be swung around so that the blows could be givensuccessively on the lower and upper arm witho
Memoirs of the National Academy of Sciences . s. The accuracy of is measured with blows of varying force-(Webers law) and the correlation of velocity, mass aud area determined (e. g., is the sensation the same when theivelocity is 1 and the mass 2 as when the mass is 1 and tlie velocity 2). MEMOii;a UF THE ^ATIO^^AL ACADEMY OF SCIENCES. 413 done and tlie part sn|ipnrted by siinjilc, devices. Tims tlie arm was placed comfortably in a paddedwooden box and tlie base of the liamiiicr could be swung around so that the blows could be givensuccessively on the lower and upper arm without moving thii arm. The iM)ints used were the backof the lower and upper arm (E and /, (jpposite the jwints /. and />, tig. 7), at a, distance of .lOcm., the lower and upper i)arts of the thigh {G and H, the front of the leg, but anatoniicallycorresponding to the back of the arm) at a distance of 25 cm., the back of the second joint of tlieleft forefinger (7 ) and of the left great toe (J), the cheek (A) belovv the zygoma about 2 cm. from. the base of the concha of the ear, and the back of the necik (L) over the second spinal wei-e also made with the hand and foot, the stimulus being applied on the expernneuts were made in sets, U and F, G and H, I and J, K and i, and the inovementwith foot and hand, respectively, being made simultaneonsly. Experiments made simultaneouslyand under the same conditions can be best compared, but our times were found to vary but littlefrom day to day. In these experiments the objective force of the blow was always the same(a weight of 30 grams falling 20 em.). The reactions were measured singly, the variations of theseparate times from the average time of the series and of the separate series from the averagetime of the set both being given. Table XI.—lieactioii-times on blows on various parts of the body. D, C, and J observers. 2,000 reactions. F. I .. I .. I .. D. Back of lower arm Bac
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