42 
3. Expose some of the dots (not more than seven or eight 
at a time) by covering the remainder with a card or a piece 
of paper, and desire the man to name their number and 
relative positions. 
4. Vary the groups frequently to provide against 
deception ; by using a covering card with a square portion 
cut out of one corner, six different groups of dots may be 
exposed without exceeding the number of dots above- 
mentioned. The test-dots should be kept perfectly clean. 
At what distance can a man count the test-dots in 
conformity with the instructions on that head ? 
Power of distant vision can only be tested by ex¬ 
temporised modes of comparisons with that of Europeans. 
It has been noticed that amongst North American Indians a 
small distant object on the prairies will be recognised by 
each individual at the same instant and give rise to a 
simultaneous exclamation from the whole party. The power 
of judging distance may be greatly improved by practice ; 
but some men show far greater natural aptitude than others. 
In the case of native troops, when judging-distance practice 
is conducted according to the English method, the results of 
the practice should be recorded. 
The following are the rules for judging-distance practice ; 
the object judged from is usually a group of two or three men ; 
the number of answers and points obtained should be recorded. 
The value of men’s answers, by points, in the several classes 
is as follows :— 
3rd class, or when judging' 
distance between 100 and > 
300 yards . 
2nd class, or when judging" 
distance between 300 and > 
600 yards . 
within 5 yards 3 points 
10 „ 2 „ 
15 „ 1 point. 
5 ? 
33 
within 20 yards 2 points. 
30 „ 1 point. 
33 
1st class, or when judging 
distance between 600 and 
900 yards .... 
within 30 yards 2 points 
40 „ 1 point. 
• •• • 
•••i J 
33 
