162 OXALIC ACID. 
3. CITRIC ACID. 
608. This acid exists in the juice of Oranges and Lemons 
(Citrus aurantium and C. limonum), of Cranberry and Whor- 
tleberry (Vaccinium oxycoccos and V. vitis-idea), and Com- 
mon Dog-rose (Rosa canina), and in several other fruits. It 
gives the juice of the Lime and Lemon their acidity. It 
consists of 
Carbon, 4equivalents 24 or 41.369 
Cyn, So 32 64882 
Hydtorven, 208.053. 2 ted 3.8 
58 parts. 100 parts. 
4. OXALIC ACID. 
609. This acid contains no hydrogen, consisting of OF: 
gen and carbon alone. It is found uncombined in the juice 
of the Chick Pea (Cicer arietinum) ; but is generally in com- 
bination with lime or potassa. It is found in union with the 
latter of these in Common Sorrel (Rumex acetosa), Wood 
Sorrel (Ozalis acetosella), andin the Geranium acidum. It 
has been found by M. Barconnot in several species of lichen, 
in combination with lime. It consists of : 
Carbon, 2 equivalents 12 or 33,34 
Oxygen Soe 24 = 66.66 
3 —— 
36 parts. ‘100 parts. 
= 5. BENZOIC AcID. 
O10: This acid is found in the balsams, as gum benzoin, 
_ storax, balsam of Tolu, &c. It has been found by M. Vo 
-_ gel in the flowers of the Trifolium melilotus officinalis (Com 
mon Yellow Melilot.) The fragrance of the Sweet-scented 
