SECT. I. UM. 387 



According to the analysis of Gay Lussac and Radical 



. f. ,, . elementsb 



Thenard, it consists of the following elements, m 

 the following proportions, 100 parts being the 

 integer : 



Carbon 42-23 



Oxygene *. 50'84? 



Hydrogene 6-Q3 



Saline and earthy matter, a small quantity 



Total 100-* 



Gum Tragacanth is the produce of the Astraga- Gum tn- 

 Ins Tragacantha, a thorny shrub that grows in the gac< 

 islands of the Levant, from the stem and branches 

 of which there exudes spontaneously a gum resem- 

 bling gum arabic in its essential properties, but dif- 

 fering from it in the shape assumed by the concrete 

 mass, which is generally that of thin and twisted 

 or channelled plates. It is also less transparent than 

 gurn arabic, and not so easily dissolved in water. 



Cherry-tree Gum is obtained from the Prunus cherry- 

 avium and other species of the same genus, and i n lree s um - 

 general from all trees with stone-fruit, from which it 

 exudes spontaneously and in great abundance. It dif- 

 fers from gum arabic and tragacanth in its concret- 

 ing in larger masses, and being more easily melted. 



Mucilage is found chiefly in the roots and leaves 

 of plants, particularly such as are bulbous and suc- 

 culent the bulbs of the Hyacinth and leaves of th 

 * Traitfcde Chimie Elcupentaire. 



