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we are already acquainted on the old continent, 

 A celebrated botanist, who by his excursions has 

 rendered great services to the botanical geo- 

 graphy of Europe, Mr. Decandolle, thinks, that 

 the pine of Teneriffe is equally distinct from the 

 pinus atlantica of the neighbouring mountains 

 of Mogadore, and from the pine of Aleppo % 

 which belongs to the basin of the Mediterranean, 

 and does not appear to have passed the Pillars 

 of Hercules. We have met with these last pines 

 on the slope of the Peak, near twelve hundred 

 toises above the level of the ocean. In the Cor- 

 dilleras of New Spain, under the torrid zone, 

 the Mexican pines reach as high as two thou- 

 sand toises. Notwithstanding the similarity of 

 structure, that exists between the different spe- 

 cies of the same genus of plants, each of them 

 requires a certain degree of temperature and 

 rarity in the ambient air, to attain it's due 

 growth. If in the temperate climates, and 

 wherever snow falls, the constant heat of the 

 • soil is somewhat above the mean heat of the at- 



* Pinus halepensis. Mr. Decandolle observes, that this 

 species, which is not found in Portugal, but grows on the 

 Mediterranean side of France, Spain, and Italy, in Asia 

 Minor, and in Barbary, would be better named pinus medi- 

 terranea. It composes the principal part of the forests of pines 

 in the south-east of France, where Gouan and Gerard have 

 confounded it with the pinus sylvestris. It comprehends the 

 pinus halepensis, Mill., . Lamb., and Desfont., and the pinus 

 maritima, Lamb. 



