ri2 



KANSAS UNIVKRSr|-V (^lARTERLV. 



and the screen (H), without knowinj^; the size of the former or the 

 distance of the latter. Then afterwards he was shown the boxes, 

 and allowed to handle them and to learn their respective dimen- 

 sions, informed of the distance of the curtain, and permitted to 

 judge the distance of the objects, when again suspended, but with- 

 out looking through the tubes. In this way the judgment was 

 assisted in every way possible, except in seeing the objects moved, 

 which was* in no case permitted. 



In the former case, when the tubes were used, the same definite 

 series of positions was estimated in three ways: with ;/>/// eye. 

 with /('// eye, and with both eyes, one tube being closed for monoc- 

 ular vision. In seeing directly (without the tubes) only binocular 

 vision was used. 



In addition to the above series of tests a shorter one was given, 

 using the tubes and binocular vision (with 2 in. box), to illustrate 

 Wundt's Law regarding judgment of the distance of ol^jects when 

 moving closer and closer, or farther and farther. 



Each of the ten subjects made observations requiring a sitting of 

 an hour or more. Care was taken to have the room lighted evenly 

 in different parts, and the same set of tests was given to each sub- 

 ject in as nearlv the same manner as possible. 



Below is shown a tabulated report of 160 average judgments, 

 made from 1,600 tests upon ten subjects. Arabic numerals at the 

 top of each of the four columns are used to indicate different sized 

 boxes used, the boxes being named in thj order of their sizes, be- 

 irinninsj' with the smallest box. 



