ON TRAPA NATANS. aa 
, 
nearly analogous with those prevailing in the countries where it is still 
an. Itis also not impossible that 
the extinction of our plant is connected with the drying up of the 
d me i i 
measure 
Igium. Perhaps its destruction may also have been forwarded b 
fishing with the drag. But though it is very probable that the plant 
has by such means been exterminated in many localities, its almost 
complete disappearance from the north of Europe cannot be so 
explained. in thi i 
isen. Nor is it" 
that the fruit of this plant, at least during the historical period, has 
i countries. Its employ- 
only, then, it is impossible to-find out the real cause of its disappear- 
ance. But bearing in mind that some other plants and animals of a 
R 
