380 FOUNDATIONS OF BOTANY 
450. Study of Transportation by Water. — Nothing less 
than a long series of observations by the pond-margin and 
the brookside will suffice to show how general and impor- 
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Fic. 269. — Tumbleweeds ! lodged against a Wire Fence in Winter. 
tant is the work done by water in carrying the seeds of 
aquatics. An experiment will, however, throw some light 
on the subject. 
EXPERIMENT XL 
Adaptation for Transportation by Water.— Collect fruits of as 
many aquatic, semi-aquatic, or riverside and brookside species of 
plants as possible, place them on shallow pans of water and notice 
what proportion of all the kinds studied will float. Leave them 
twenty-four hours or more and see whether all the kinds that floated 
at first are still afloat. Some desirable fruits for this experiment 
1 Amarantus albus. 
