200 ON THE PREPARATION OF QUINIA AND CINCHONIA. 
The delicacy of this test is such that it produces a precipi- 
tate with cinchonia where only one part is dissolved in 1500 
parts of water. The sulphate of lime formed at the same 
time, having sufficient water for solution, does not precipi- 
tate. 
2. Chloride of calcium does not precipitate sulphate of 
quinia, but produces a precipitate with sulphate of cinchonia. 
3. Sulphate of quinia gives a precipitate with lime water, 
but is re-dissolved by an excess. The precipitate of cincho- 
nia is not re-dissolVed. 
4. 5, 6. Ammonia, carbonate of ammonia, and potassa af- 
ford similar results. 
7. Caustic soda produces a precipitate in both, which is 
not re-dissolved by an excess of the soda; but the quinia 
precipitate is pulverulent, and the cinchonia, curdy-white. 
By these seven tests it will always be easy to distinguish 
between quinia and cinchonia, and to detect any admixture 
of these two bases, but the chloride of lime is that which 
should be employed when the proportion of cinchonia is 
very small. 
L. Ed. D. Phil. Mag. 
