128 
SELECTED ARTICLES. 
ART. XXII.— ACTION OF RE-AGENTS UPON THE SOLU- 
TIONS OF THE DIFFERENT SPECIES OF CINCHONA 
OCCURRING IN COMMERCE.* By E. F. Anthon. 
The author has devoted much attention to the species of 
cinchona as they occur in commerce. They were subjected 
to examination by employing always an infusion of the same 
strength. One part of bark cut into small pieces was digested 
with 4 parts of distilled water, allowed to stand at rest for 12 
hours, filtered, and then exposed to the action of re-agents. 
The re-agents employed were the following: 1. Pure ammo- 
nia, diluted with pure distilled water to the specific gravi- 
ty .990; 2. pure hydrate of potash, dissolved in distilled 
water diluted to the specific gravity of 1.080; 3. carbonate of 
potash, from bitartrate of potash, disolved in 8 parts of water; 
4. iodide of potassium, in 6 parts of water; 5. binoxalate of 
potash, in 8 parts of water; 6. pure sulphate of soda, in 6 parts 
of water; 7. pure sulphate of copper, in 12 parts of water; 8. 
fresh-formed sulphated protoxide of iron, in 6 parts of water; 
9. subacetate of lead, a mixture of 6 parts pure acetate of lead 
with 3 parts of fine scales, and 21 parts distilled water; 10. pure 
neutral acetate of lead, in 8 parts of water; 11. a saturated so- 
lution of pure corrosive sublimate; 12. pernitrate of mercury, 
by dissolving pure oxide of mercury in boiling nitric acid, 
diluted with 8 parts of water; 13. subnitrate of mercury, by 
digesting pure mercury with dilute nitric acid; 15. a saturated 
solution of tartar emetic, previously purified by crystalliza- 
tion; 16. pure crystallized nitrate of silver, in 16 parts of 
water; 17. pure sublimed chloride of iron, in 8 parts of water; 
18. recently formed muriate of iron, in 8 parts of water; 19. 
saturated solution of nitrate of barytes; 20. sulphuric acid, 
specific gravity 1.090; 21. muriatic acid, specific gravity 1.030; 
22. infusion of galls, by digesting 1 part of coarsely powdered 
galls with 4 parts of hot water, and filtering; 23. alcohol of 
* Pharmac. Central-Blatt., July, August, 1836. 
