hor aebeletatios the interaction ‘the abo Mee may meats 
alcoholic solution, for some hours on a water-bath under a reflux. 1 
alcohol is evaporated and the residue dissolved in water: the acid 
quantitatively into the solution, the condensation-product remains back a 
In the filtrate ans bys is estimated by titration Beaiost: iodine. 
from Lautenschlager's description of his method for determining the van fin p ssent 
in vanilla beans: — we a eae 
3.5 g. vanilla beans are extracted for one hour ait: 5 Ge, bailing di luted OOS 
on a water-bath under a reflux condenser. After Aityavien the alcohol is ¢ 
solution are mixed with 50 cc. decinormal iodine solution, alkalified — means oto 
soda, after short standing acidified with dilute sulphuric acid and the excess. 0 
titrated back with sodium hyposulphite ‘solution. For this purpose, 8.1. cc. d 
hyposulphite solution were required. From these figures, a Percentage of 1. 7 ol is 
in the vanilla was calculated‘), _ pi Te ah bs: 
Similarly, he found in Ceylon cinnamon oil 2, 9 per cent., in cassia oil 70 per cent.) 
and in Ceylon cinnamon bark 0.72 per cent. of cinnamic Pes oe ara 
following determination of the ketone in carvone: — i ‘ i 
1 g. of the substance was heated with 50 cc.. alcoholic ‘normal viydtaaide ‘solunr 
for five hours on a water-bath beneath a reflux condenser. The alcohol being evaporated wt 
the mixture was treated with water, the precipitate formed filtered off, and the filtrate 
filled up to 250 cc. with distilled water. 25 cc. of this solution were mixed with 50. eos ¥ 
decinormal iodine solution and some caustic soda solution, and consumed, after_acid-— 
ification with dilute ‘sulphuric acid, 13.3 cc. Reena sodium Hepes poe 
according to the methods described above and compiled them in ‘ebulee fonts" so Asay 
to prove-the reliability of the methods. The table, in fact, gives model figures. which 
are in nearly full accord with the theoretical values. The aldehyde content, g 
was found for benzaldehyde 99.1 per ce cinnamic aldehyde 100.0 per ee 
100.7 per cent. chee acne 
We submitted Lautenschlger Ss hydrazine sulphate method for examining 
“solution. After occasional shaking the mixture was put aside for + several nurs 
