ORGANIC ALKALIES AND IODIDE OP POTASSIUM. 33 
serving the same relative proportions as in the sulphate of 
quinia, i. e. one of acid and two of quinia. 
To ascertain whether a monohydriodate of quinia could 
be formed, the following experiment was performed at the 
suggestion of our friend Professor Bache, — one-fortieth 
part of the combining proportions of the substances being 
used ; thus, disulphate of quinia, eleven grains ; sulphuric 
acid, one grain, (_ 9 _ths;) water, an ounce, were boiled 
several minutes. Litmus paper showed the presence of 
free acid. To this was added iodide of potassium, eight 
grains and a half, and boiled again. When cold, hydrio- 
date of quinia, as a tenacious mass, was deposited on the 
sides and bottom of the vessel. The' mother water, still 
having an acid reaction, being poured off and evaporated 
to dryness, and treated with absolute alcohol, left undis- 
solved a portion of sulphate of potassa. The alcoholic 
solution, evaporated to dryness, yielded several grains of 
iodide of potassium. Although the relative proportions in 
this experiment were such as to neutralize each other and 
produce a mono-salt of quinia, the undecomposed iodide 
of potassium obtained from the solution proves that the 
two equivalents of quinia in the sulphate united with but 
one equivalent of hydriodic acid derived from the iodide of 
potassium, — the free sulphuric acid still remaining uncom- 
bined. 
