13 



The calcareous concretes of Brognon, near Dijon, con- 

 tain unexhaustible mines of vegetable remains, includ- 

 ing a large-leaved palm, Flabellaria latiloba, 

 met with also near Lausanne associated with ferns, one 

 of which appears to be arborescent, oaks, laurels, a 

 jujube tree, and fig tree. The miocenes are supposed 

 to be represented in England by the lignites and clays 

 of Bovey Tracey, in Devonshire (but, perhaps, the 

 result of Mr. Gardner's examination of the Bournemouth 

 Beds and a correlation of both may relegate them 

 to an earlier geological period), in Ireland by the 

 basalts of Antrim, and of the Giant's Causeway, and the 

 Island of Mull in Scotland. The miocene flora of 

 Greenland comprises more than a hundred and thirty 

 species, of which some fifty-six only are identical with 

 those of the same age in central Europe, and more than 

 half the number do not now grow within ten degrees 

 of the South of Greenland. M. Herr shews that in the 

 flora of the Swiss miocenes about nine per cent, of the 

 vascular plants are homologous to existing species, and 

 of seventy-two species thirty-three live in America, six- 

 teen in Europe, and twelve in Asia, the remaining eleven 

 are scattered about elsewhere. Prominence is given to 

 the Atlantic types by the numerous evergreen oaks, 

 maples, poplars, Eolinice^Sequoice^ Taxodia, andternate- 

 leaved Pines, thus the northern hemisphere has played 

 an important part in the distribution of plants, a greater 

 number having migrated from north to south than ia the 

 reverse direction, for large assemblages of plants seem to 

 admit of being traced back at some time of their history 



