1386 
read 
the values every group 
working-rate of the quick, 
as the labour proceeds. 
for we 
in a minute was calculated for every group. 
By comparing 
can conceive the changes in the 
the fairly qaick and the slow-workers 
The quick workers among the boys and the girls work invariably 
harder in the third period than in the first and second; 
two their working rate is about equal. 
in the last 
In course of time the differ- 
ence ‚in working-rate with this category of boys and girls between 
the first and the third period first decreases (from 8 to 10), then 
remains constant (the differences 
between the third and the first 
periods are resp. 29, 18, 15, 15 and 15°/,). For the rapid workers 
among the girls the difference in working-rate between the third, 
and the first period decreases a little from the 10 to the 12% year, 
although not much; 
The fairly 
and in the 
girls we also find that they work 
third harder 
the differences are resp. 21, 22 and 24°/,. 
quick boys always work hardest in the 2¢ period, 
than in the first. 
As to the fairly quick 
hardest in the second period but, 
contrary to the boys, they work quicker in the first period than in 
the third. Since the changes in the working-rate in the three periods 
with the fairly quick and the slow workers among the boys and 
girls are not so simple as with the quick workers, we have tabulated 
below for the quick, the fairly quick and the slow workers among 
the boys and girls the percentage with which the working rate 
increased from the first to the second and decreased from the second 
TABLE II. 
Boys Girls 
Age (years) be Quick Fairy quick Slow Quick Fairly quick Slow 
at | TI nn HIJ 111 oat I—I] an TI (III 
8 —l +30 | +33 | —24 | — 2 ae [+e + 6) —17 | +39 | +14 
9 Deg i ad i ee ae -|- | DS | 1 3R | +16 
10 Hos | +14 | +23 | —16 | — 7} +11 | 1 | +23 | + 6 | —14 | +47 | — 7 
11 40.9 | Hotes 15 | 4248 lush d Bind | +23 SLA) i218 | +28 | ts 
12 +1 Heels +22 | —13 a ay 2 | | +4) 4] —19 490 | —1 
