254 
SELECTED ARTICLES. 
Quantity of alkalies in a 
pound of bark. 
Cinchonia. 
Quinia, 
I. Cinchona barks containing cinchonia : 
(a.) Huanuco, or grey bark, 
168 grs. 
II. Cinchona barks containing quinia 
1. Yellow, or regia bark, 
(a.) Flat uncoated pieces, 
(b. ) Coated thick quills, 
(c)Thin quills, 
2. Fibrous Carthagena bark, (China ^ 
flava fibrosa. ) 3 
3. Ash bark, (China Jaen,) 
95 grs. 
84 
60 
54 
12 
III. Cinchona barks, containing both quinia 
and Cinchonia: 
1 . Red bark, 
2. Hard Carthagena bark, (China flava 7 
dura,) 5 
3. Brown, or Huamalies bark, 
4. True Loxa, or Crown bark, 
5. False Loxa bark, 
65 
43 
38 
20 
12 
40 
56 
28 
16 
9 
IV. Cinchona barks containing neither quinia 
nor cinchonia: 
False cinchona barks, 


This table must not be relied on, since its results do not 
accord with the experiments of others. We may, I think, 
presume that all the barks of the three first divisions contain 
both quinia and cinchonia, but in varying proportions. That 
the yellow or regia bark contains cinchonia, every manufac- 
turer of sulphate of quinia knows. 
The following is Geiger's arrangement: — 
Div. 1. — Cinchona barks, in which the Cinchonia predomi- 
nates: this includes the Huanuco, Huamalies, Ash, Loxa, 
and false Loxa barks. 
Div. 2. — Cinchona barks in which the Quinia prevails: this 
includes the regia or yellow bark only. 
