448 MEMOm ON THS 



as white and cryftalline as poffible, ^ It is^ 

 generally, in pieces as broad as the hand, 

 and from one to two inches in thick- 

 nefsj when it has not been broken. Ode 

 muft not, however, be too nice in having it 

 always in large maffes: were they no bigger 

 than an egg, it is a matter of no confe* 

 quence, provided they are white and pure* 

 The borax procured from Surat, is much in* 

 ferior to that of China* 



Rhubarb, 



THIS 15 a large root, which grows in 

 low, cold, moift places, in the provinces of 

 Houquang and Lemtong* Its leaves are 

 broad, of a dark green colour, and have an 

 acid and agreeable tafte. When the root is 

 taken from the eaith, its outer bark is fcraped 

 off, as well as the thin yellow membrane 

 5 which 



