350 BOTANY. 



j night be plentifully cultivated in several of our 

 provinces, where it succeeds perfectly, although 

 its seeds ripen with difficulty. 



The plants preserved in herbals, which we al- 

 ready possess, may be employed in making ex- 

 changes with other countries, and thus establish 

 one nomenclature. 



Gums, resins, dye-woods, vegetable productions 

 employed in medicine, can be analysed, and positive 

 information given on objects which are now but 

 imperfectly known. We must allow that, notwith- 

 standing all our care, there are always some objects 

 amongst our collections which are destroyed by 

 time, and which it is useful to renew. 



Collections of vegetables, from whatsoever country 

 they come, always present something new; and 

 there are some places so little known, that we desire 

 to receive every thing which can be procured from 

 them. 



We will now give a brief list of a few objects 

 which would be particularly useful. 



The North of Europe. 

 The Lithuanian pine. 



The Northern Coasts of Africa. 



The lawsonia (Fam. salicarias), the leaves of which 

 dye a yellowish red. 



