I860.] REVIEWS. 285 



It is not very difficult to give a moderately feasible account of 

 the migration of these species and their settlement in this coun- 

 try. They probably came with agricultural produce, as the 

 Wandsworth plants certainly did, or they were imported with 

 merchandise, or by some accident — a wide word, comprehending 

 many ways too numerous and too uncertain to be particularly 

 pointed out here. If it be asked. Why did not the same causes 

 produce the same effects in Belgium ? it may be replied, that the 

 winter temperature is too low in the north of France and Bel- 

 gium to permit these natives of a southern clime to effect a 

 settlement in these quarters. 



The climate of England is unusually mild, owing to the gulf- 

 stream, our insular position, sheltered situation in divers places 

 under hills and mountains. Hence many species gain a footing 

 here which could not exist in Continental parts of the same lati- 

 tude. And hence, also, the Flora of the British Isles is con- 

 tinually increasing. 



This work of Mr. Munby's is a mere catalogue, consisting of 

 about two sheets, or double the size of the ' London List of 

 British Plants.^ It contains the orders, genera, and species, 

 with authorities for the specific, generic, and ordinal names. 

 Here and there a synonym is added, but no indications of the 

 habit, habitat, range, or census of the species. These particulars 

 would probably have entailed more labour on the compiler than 

 he could have afforded for the small remuneration afforded by 

 the sale of such works. 



In a supplement the following rare and common British species 

 appear, viz. Thlaspi arvense, Isatis tinctoria, Linum usitatissi- 

 mum, Geum urbanum, Prunus insititia, Borago officinalis, Teu- 

 crium Chamadrys, Daphne Laureola, Buwus sempervirens, Orni- 

 thogalum umbellatum, Neottia spiralis; these are additional 

 examples of the relationship existing between the Floras of 

 Britain and Algeria. Thanks are tendered to M. Munby for his 

 enlarged list of north African plants, and it is respectfully re- 

 commended to the readers of the ' Phytologist.^ 



