And there is little doubt but many plants of Chili, and even 

 thofe which growwithin the tropics, when found near the ele- 

 vation of perpetual froft, would bear the cold of Spitzbergen ; 

 for on the tops of mountains are found the plants of the plains 

 of more northern latitudes. Thus is the Salix herbacea of 

 Lapland and Spitzbergen found on the tops of Mourne ,inown- 

 tains at about the elevation of 2,500 feet. On the Serra. of 

 Madeira, latitude 32°, 38', and, elevated 5,162 feet, is found 

 the Erica Arborea, of the neighbourhood of Genoa, latitude 

 440^ 25'*, Therefore as the temperature which prevails at the 

 elevation of 5,162 feet, in latitude 32*^, is found nearly to cor- 

 refpond with that of 51° north : the Erica Arborea, which 

 grows at that elevation in latitude 32°, will find a climate 

 fuited to its nature in latitude 5 1° t- But as the before mentioned 

 plants have a confiderable range of latitude, it may be cultivated 

 farther north when the foil and fituation are favourable. At 

 James Holmes's, Efq. on the eaftern ihore of Carrickfergus bay, 

 four miles north of Belfatt, there is a plant in the greateft vigour 

 at the prefent time (Jnly 1799) which has now flood uninjured 

 three as fevere winters as Ireland ever experienced, viz. 1794, 5, 

 1797, 8, and 1798, 9. _ 



Ths 



* See Sketch of a tour on the Continent, by J. E. Smith, M.D.. F.R.S, &c. 

 page ioo. Vol. I. 



f On dividing 15,577, the height of perpetual froli: at the equator, by the diffe- 

 rence of the terupcratttif above and below, it is found that every 299 feet of ele- 

 vation 



