42 PREPARATION OP THE HYPOSULPHITE OF SODA. 
Pale Yellow Cartbagena Cinchona bark."] 
— (Hard Carthagena bark Angl. — | 
Quina amarilla Mutis. — China flava \ 
dura Bergen.) J> C. cordifolia Mutis. 
Orange yellow Carthagena Cinchona | 
bark (Quinquina de Maracaibo. — Chi- | 
na flava fibrosa Bergen) J 
Pitayon Cinchona bark, or false Pitaya \ 2 
Cinchona bark \ 
The following, according to M. Guibourt. are the most active barks ; 
5. Non-verrucous true red Cinchona bark 
6. Red Lima u 
7. Grey Lima " 
8. Verrucous white Huamalies u 
1. Calisaya Cinchona bark 
2. Yellow orange " 
3. Pitaya " 
4. Verrucous true red " 
Pharm. Journ. Wed dell, Hist. Naturelle des Quinquinas ; 1849. 
ART. VII. -Qx\ THE PREPARATION OF THE HYPOSULPHITE 
OF SODA. 
By M. Facet. 
The composition of this salt as met with in commerce is 
not always the same ; it varies according to the process 
employed in its production. When it is prepared with the 
bisulphite of soda and sulphur, the product consists of a 
large quantity of sulphate and but little hyposulphite. 
It is best procured by boiling the neutral sulphite with 
sulphur. However pure the neutral sulphite may be, the 
hyposulphite will be mixed with a small quantity of sul- 
phate. M. Pelouze explains the presence of this sulphate 
by the boiling water in the presence of sulphur and the 
hyposulphite. I have never however been able to detect 
the least trace of sulphuretted hydrogen, even on boiling 
the hyposulphite with sulphur for a long time. I should 
rather explain the presence of this gas by the simultaneous 
action of the water and sulphur upon the excess of alkaline 
