ON CINCHONA. 
317 
the same numerous transverse annular cracks already described 
as belonging to the Loxa bark of commerce. 
Chemical properties. — We have two analyses of this kind 
of bark: one by Pelletier and Caventou, the other by Bucholz. 
In sixteen ounces of commercial Loxa bark, the last mentioned 
writer found the following soluble constituents: — 
Drs. 
Grs. 
Fattv matter, with chlorophvlle 
1 

Bitter soft resin . ... 
o 

Hard resin (red insoluble coloring matter) 
12 

Tannin, with some minims of acetic acid 
3 

Cinchonia ...... 

28 
Kinic acid 
1 
30 
Hard resin, with phyteumacolla 
1 
47 
Tannin, with chloride of calcium . 
4 
25 
Gum ....... 
5 
40 
Kinate of lime ..... 
1 
40 
Amylum, a small quantity. 
But, though quinia is not here mentioned, 
there is 
no doubt 
but that it exists in this kind of bark, though in small quan- 
tity. Von Santen gives the following quantities of sulphate 
of quinia obtained from 100 lbs. of Loxa bark: — 
Ounces. 
Thin selected quills 1.042 
Moderately thick pieces ..... 4.444 
Selected thick heavy pieces, with grater-like bark 11.104 
2. Silver or Gray Cinchona. 
History and synonymes. — This bark was first carried to 
Santander, in Spain, in the year 1799, by the frigate La Veloz. 
It is known in this country by the name of Silver or gray 
Cinchona ; in France by that of Lima bark ; in Germany 
by that of Huanuco, Yuanuco, or Guanuco bark. 
Commerce. — It is imported usually in chests containing 
about 150 pounds, and also, though less frequently, in serous 
of from SO to 100 pounds. 
