in. INTRODUCED SPECIES. 



97 



owe their existence in Britain to human agency ; some 

 few very uncertain stragglers, seldom mentioned in 

 books, being omitted. The second column repeats the 

 terms applied to the species in former volumes of this 

 work ; an (enclosed) abbreviation being added occasion- 

 ally, in order now to suggest a change to another term, 

 instead of the one before applied. The third column 

 shows the opinion of M- De Candolle compressed into 

 one or two words, so far as this can be done from the re- 

 marks made on the plants in the Geographic Botanique. 



