2 I I 
Origin and Development of the Composite. 
Table X. 
Distance of tube 
from fan. 
135 
cms. 
23-5 
»* 
33-5 
J 9 
43-5 
99 
53 5 
9 9 
63-5 
73-5 
99 
83-5 
99 
93-5 
9 9 
103-5 
9 9 
113-5 
9 9 
123-5 
99 
133-5 
9 9 
143-5 
99 
153-5 
99 
163-5 
99 
173 5 
99 
183-5 
99 
193-5 
9 9 
203-5 
9 9 
213-5 
1 9 
223-5 
19 
233-5 
99 
243-5 
9 9 
253-5 
9 9 
263-5 
9 9 
Distance fruit 
was blown. 
out immediately. 
9 9 9 9 
9 9 9 9 
9 9 99 
9 9 9 9 
out, touched. 
99 99 
9 9 9 9 
out slowly, 
out, more slowly. 
39-72 
cms. 
24-30 
9 9 
18-30 
9» 
17 22 
99 
15-18 
9 9 
11-13 
9 9 
9-14 
99 
5-7 
9 9 
5-9 
9 9 
4-6 
9 9 
3 4 
9 9 
2-3 
9 9 
2 4 
99 
0-4 
9 9 
0-3 
99 
1-3 
9 9 
Pressure on disc in 
gms. per sq. cm. 
•0422 
•0242 
•0168 
•0132 
•0107* 
•00110 
•0078 
•0068 
•0061 
•0055 
•0051 
•0046 
•0043 
•0040 
•0037 
•0035 
•0033 
•0031 
•0029 
•0028 
•0026* 
•0025 
•0024 
•0023 
■0022 
•0021 
Velocity equiva 
lent in m.p.h. 
4-11 
3 11 
2-59 
2-29 
2.06 
1-84 
1-76 
1-64 
1-56 
1-48 
1-42 
1-35 * 
1 -31 
1-26 
1-21 
1-18 
1-14 
111 
1-07 
1-05 
1-01 
1-00 
•98 
•95 
•93 
•91 
Table X. Observations on Fruit Dispersal of Taraxacum 
officinale. For explanation see text. 
Between the point at which the fruit was blown through the 
tube with no stop whatever and the point at which the fruit was 
not moved when once it had fallen there was an interesting transi¬ 
tion region from 63-5 cms. to 173’5 cms. in which the fruit was 
blown along in jumps. 
Up to 53-5 cms. the fruit was blqwn straight through, and as far 
as could be seen did not touch the tube at all. From 63-5 cms. to 
1035 cms. the fruit was blown along trailing with its tip just 
touching the tube or in a few long jumps. There was sometimes a 
distinct interval between the jumps, during which the fruit 
remained lying quite still or showed only feeble signs of move¬ 
ment. This period of rest indicates slight changes in the pressure 
of the wind, but these were so slight that they are for the present 
negligible. 
The time taken by the fruit to reach the end of the tube 
increased considerably from 93’5 cm. to 103’5 cms., and after that 
only five minutes were allowed to elapse between inserting the 
