CONTENTS. 



Page 

 On the Organs of Perspiration in Plants, by J. Hediuig . 1 



On the Botanical Geography of the South-Western 



Parts of Europe, by Professor Link ... 27 



On the Nature and Mode of Production of the Aloes 



Wood, by /. de Loureiro 75 



On the Genera of Orchideas, and their Systematic Ar- 

 rangement, by Professor O Swarz .... 91 



Genera and Species of the Natural Order of Orchideas, 



by Professor Swarz 121 



Botanical Obsenrations, by Dr. M. Borhbausen . . . 215 



Account of the Ule Tree, and of other Trees produ- 

 cing the Elastic Gum, by DonV.de Cervantes , . 23Q 



Observations on the Genera Juglans, Fraxinus, and 

 Quercus, in the neighbourhood of Lancaster 

 in North America, by the Rev. H. C. Muh- 

 lenberg — With the Remarks of Professor C. 

 L.Willdenow 241 



Observations on the Plant called Erica Diaboecia, 

 shewing the necessity of referring it to a 

 different Genus and Order, by Prof. Juffieu . 261 



Botanical Observations, by Frederi Ehrhart . . . 265 



