40 
he ride in one day ? 6. What distance can he run in one day ? 
7. In what time can he run an English mile of 1760 yards, or 
2112 paces of 30 inches, on a level road or grass ? 8. In what 
time can he walk ten or twenty miles on a fairly level road or 
grass ? 9. In all trials of speed or endurance the temperature 
and the manner in which the individual is shod and clothed 
should be recorded, as also a general description of the ground 
traversed. 10. What weight can a man raise one foot from 
the ground, the handle being properly adjusted ? 11. How 
far can he shoot an arrow or hurl a spear ? 12. How long can 
he abstain from food or drink, without inconvenience, when 
in exercise ? 13. Ditto when not in exercise ? 14. Have they 
any drugs, or practices of any kind whereby they conserve 
their energy during labour, or believe that they conserve it. 
J. B. 
Further Notes on the same Subject . 
Valuable data on the above points, as well as those treated 
of in The Senses , p. 41, in the note to Heredity , p. 48, and 
in Psychology , p. 53, are easily obtained by recording the 
number of persons out of any rather large number of them 
(say of more than 50) who succeed in achieving two (or 
better, three) definite tests of different degrees of severity. 
Thus— 
How many succeeded and how many failed to lift the 
specified weights A, B, C, respectively ? 
How many succeeded and how many failed to run the 
specified distance D in k, l , and m, seconds ; or else, how 
many succeeded and how many failed in running the specified 
distances E, F, G, in n seconds ? 
How many dropped out, and how many marched on after 
eating no food for r, s, t hours respectively ? and so on. 
The magnitude of the tasks or tests selected should be such 
that, very roughly speaking, a quarter of the whole number of 
persons observed may be expected to fail in the first, one-half 
in the second, and three-quarters in the third. The method 
