in. INTRODUCED SPECIES. 87 



An illustration of what is here intended may render the 

 argument more clear. A good " Geographico-Botanical 

 Disquisition" on the plants of Holland was published by 

 Dr. Miquel in 1837. In that work its learned Author 

 enumerates several species which are deemed natives of 

 the Netherlands and Hanover, but which have not been 

 recognised as belonging to the flora of England. If any 

 of those species should occasionally be found in doubtful 

 situations in England, it is still contended that the infe- 

 rences of foreign origin, as drawn from the primary evi- 

 dence afforded by their actual conditions in England, 

 would not be either overbalanced or set aside by the an- 

 tecedent probability of finding them wild here, because 

 they are stated to grow wild in Holland and Hanover. 



If relying ujDon such foreign records, in preference over 

 the facts themselves as they appear in Britain, we ought 

 to admit the nativity of Saponaria vaccaria, Coronilla 

 varia, Hyssopus officinalis, and various other plants, 

 hitherto not acknowledged as being really British, al- 

 though they have actually be,en found in one or more 

 places in England. Nor is it easy to see, if relying upon 

 the indirect evidence, to the extent which M. De Can- 

 doUe seems disposed to rely on it, how we could reject 

 Globularia vulgaris, Lotus siliquosus, Galega officinalis, 

 Cynanchum vincetoxicum, and manj' other plants on 

 record for Western Europe, if they should hereafter be 

 found in Britain anjTvhere outside the fences of a garden. 



A more special example, taken from the work of M. 

 De Candolle himself, may further serviceably illustrate 

 the differences adverted to. He allows that Anemone 

 apcnnina is only a naturalised plant in Britain ; but he 

 does not see reasons sufficient for believing the rarer and 

 less-established Anemone ranunculoides to be so likewise. 

 He states that the latter species is found in Scandinavia, 



