84 NOTICES OF BOOKS. 



6. The 48 remaining species are divided into— those cultivated in 

 fields, parks, and gardens (29); those easily transported in ballast, or 

 mixed with other seeds (9) ; and those that are not to be accounted 

 for by culture or facility of transport : the list of these latter we shall 

 cite, as they give rise to much curious speculation : — 



Geranium Pyreaaicum, L, Datura Stramonium, Z. Veronica Buxbaumii, Ten. 



Sedum dasyphyllum, L. Scrophularia vernalis, L. Lamium maculatum, Z. 



„ alLum, Z. Linaria supina, Besf, Euphorbia Cypanssias, Z. 

 Pyrethrum Parthenium, Z. 



7. Of the whole 70, only one remains, whose existence is very ano- 

 malous, the Ononis recUnata : this may have been conveyed by cur- 

 rents or birds, but M. de CandoUe incUnes to the supposition that it 

 was more probably introduced by man. 



8. The 10 North American species are all garden-plants, or other- 

 wise certainly introduced by man's ao-encv. 



9. The majority of tlie naturalized plants inhabit the South of Eng- 

 land. 



10. Of the 83 species, 19 are annual, 8 biennial, 52 have perennial 

 roots only, and 4 are woody-stemmed. 



11. The Dicotyledons bear a greater proportion to the Monocotyle- 

 dons amongst the naturalized than they do amongst the indigenous 

 species. 



12. The proportion of species with a pappose seed is very small. 



13. One aquatic alone is included in the list {Anacharis Ahinastruni) . 



14. The absence of saline plants is most remarkable. 



15. There is but one Leguminous plant; though the seeds of that 

 Order are so easily preserved, and so many species grow in the parts 

 of the Continent very near to England. 



16. The greater number are found on old walls or in very artificial 

 localities. 



17. The number of naturalized species has been increased by 55 

 since the publication of Kay's 'Synopsis,' by DiUenius, in 1724; of 

 this number, 19 have been introduced since the year 1800. 



18. Within the last 3000 years it appears that, while man has been 



directly instrumental in introducing species, it is very doubtful if the 



mnds, currents, or birds have imported one during that long period ; 



certam it is, that these causes have introduced no alpine, aquatic, or 

 woody plant. 



