MISCELLANY. 
353 
temperature. In the second place, if the sugar be dissolved while the 
heat is continued, the syrup would be sensibly coloured. 
Each ounce of syrup contains two grains of codeia, according to the 
dose of M. Barbier, of Amiens. Journal de Fharmacie. 
Means of detecting the presence of farina mixed with fecula. — Several 
members of the Societe de Chemie Medicale, have been consulted upon 
the means of detecting the mixture of farina with fecula. It is conceived 
that the high price of fecula may, at the present time, render this sort of 
fraud probable, while up to the last year, this mixture could not be sup- 
posed but inversely ; that is to say, up to this time, the weight of farina 
was more likely to be increased by adding fecula. If the first falsification 
was very difficult to discover, the second could doubtless be easily indi- 
cated by many methods, and especially by the following : 
Prepare a solution containing 1 part, by weight, of pure soda, to 100 
parts of distilled water. Weigh out two grammes of the fecula to be 
tested, mix them with 100 grammes of the alkaline solution, and, at the 
end of two minutes, add 200 grammes of pure water; agitate in a brine 
prover, and allow to deposit. If the fecula be without mixture, it will 
occupy about 100 times the primitive volume of the supernatant water. 
If it be mixed with farina, the supernatant solution will be more or less 
clouded and the volume of matter less bulky. 
It will be most satisfactory to make each time a comparative trial with 
pure fecula, as the temperature may alter the effect. 
Perhaps this trial can be rendered applicable to mixed farinas, by study- 
ing the analagous reactions of divers proportions between fecula and 
farina — the presence of gluten, albumen, &c., as well as the difference 
of cohesion and volume of starch, and the fecula of the potato, at least 
permit us to hope so. Journal de Chemie Medicale, 
Action of neutral Hydriodate of Fotassa upon the Bisulphate of Quinia^ 
and the new compound which results, by M. Righini. In the Bibliotica di 
Farinacia Chemica, da Antonino Cataneo, for September, 1836, appeared 
an extract from the experiments of Dr. Inglis upon iodine, in which he 
demonstrates the action of neutral hydriodate of potassa upon sulphate of 
quinia. The phenomena, which result from this reaction, have for some 
time been studied by me, but I have not published them, because I wished 
to correct my errors. Although Dr. Inglis has witnessed the changes 
produced by hydriodate of potassa upon sulphate of quinia, yet my more 
extended experiments have demonstrated, upon analysis, that this chemist 
has been guided by a false light, in considering the compound resulting 
from the decomposition of the two salts, as an iodide, although he does 
not deny, that in the reaction an iodate is formed. 
