Experimental study of children : including anthropometrical and psycho-physical measurements of Washington school children, and a bibliography / by Arthur MacDonald.

  • MacDonald, Arthur, 1856-1936.
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: Experimental study of children : including anthropometrical and psycho-physical measurements of Washington school children, and a bibliography / by Arthur MacDonald. Source: Wellcome Collection.

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    touch simultaneously the skin on the palmar surface of the wrist, lie was asked if lie felt one or two points. In case he felt only one point, the instrument was raised and the points were moved farther apart. If ho felt the two points, they were moved closer together. Just as soon as he became uncertain in either case, as to'whether there were one or two points touching the skin, the distance between the points Fig. 5.—iEathesiometer. was read in millimeters as recorded by the scale on the rod. It takes more acuteness to distinguish two points on the skin the closer the points are together. The distance of the two points from each other, when the pupil is in doubt, is taken as a measure of his sense of local- ity. The less the distance the more acute is his .sense, and the greater the distance the more obtuse his sense of locality. RESULTS OF INVESTIGATION. It is a general principle in new lines of inquiry to regard tlie results as more or less tentative according- to tire number of experiments made. In this work the results depend upon averages, which aro valuable according to the whole numbers from which the averages are made. The conclusions, therefore, will be more trust- worthy the larger the numbers measured. In many instances those numbers are not as large as wc would desiro; but we hope this will induce some investigator to make experiments upou larger numbers. Table A.—Boys. [“Boys ” means white hoys. When colored children are meant, it is so slated.] o © CD ot Least sensibility to Strength of Least sensibility to 5 © ij o d o §4 '■d . © © rs © Class. .o ® ~Z. X © Cephalic, index. locality, b heat. 6 C J3 = Cb rc gTa © Right Left Right Left Right Left ■g O X wrist. wrist. hand. hand. wrist. wrist. 2Q r. m. Mm. Mm. Kilos. Kilos. °R. °R. r.ct. r.ct. P. ct. Bright... 237 12 4 (Dolicbo. 20) <Meso ...12ll (Brachy . 96 j 3, 791 16.1 3, 559 15 4, 687 19.9 4, 334 18.3 900. 49 3.80 828. 09 3. 51 } 8 51 41 Dull 137 13 1 (Dolicbo. 21) < Meso 56 > (Brachy. 59) 2, 222 10.2 2,133 15.6 3, 369.5 24.0 3,161 23.1 597. 50 4.36 551.25 4. 05 } 15 41 44 Average. 142 12 1 (Dolicbo. 17) <Moso ... 58[■ lBrachy. 67) 2,426 17.1 2,315 16. 3 2, 644 18.0 2,501.5 17.7 640. 25 4.62 603. 75 4. 34 } « 40 49 Unruly c. 10 14 5 (Dolicbo. 4) < Meso ... 3 > (Brachy . 3j 150 15 145 14.5 291 29.1 277 27.7 42. 50 4.25 44.00 4. 40 } 40 SO 30 Total... 520 (Dolicbo. 62) {Meso ... 238 > (Brachy .225) 8, 589 8,152 10, 991.5 10, 270. 5 2, 180. 74 2, 027. 09 12 9 11 45 44 Average 10.4 15.5 20.9 19.6 4.17 3.89 a A verage ago only is given, as the number is too small tor divisions according to ago. Ij In columns tor locality, strength, and heat both totals and averages are given. c Only lu boys wore reported unruly ■, no girls of the 518 (table 13) were reported unruly.