212 ODOROGRAPHIA. 
having, of course, been previously tared.) If the residue becomes 
hard and solid after cooling, the oil is to be considered adulterated. 
Genuine non-adulterated oil also leaves a residue (up to about 10 
per cent.), but it never becomes solid and remains in a semi-fluid 
state, even after having cooled off completely. 
“Tt will be observed that samples 1 and 2 of the foregoing list 
show a materially lower sp. gr. than the pure Chinese oils. This 
is probably in consequence of the more perfect distillatory appa- 
ratus employed by Messrs. Schimmel, so enabling more efficiently 
the removal of the highest boiling ingredients of the oil, than it is 
possible for the Chinese to do with their primitive apparatus. 
It may also be owing to the superiority of the raw material 
employed. 
“The market value of commercial oil of Cassia is estimated by the 
percentage of cinnamaldehyde present in the sample. The 
amount of cinnamaldehyde in the parcels above referred to was 
estimated by Messrs. S. & Co. as follows :— 
Pure Oils. 
INO aS teers: 88°9 per cent. 
RR MUR Ee 80°4 , 
S Pears be ats Gor POR UE Tae 
ASS Rae (294 oes 
J See oe eye 894, 
Ga) heen (6G) 
fale ye a es» 78°4 i, 
Adulterated Oils. 
NOS va. 5, cue 58:0 per cent. 
ee Sme i .! Go 3 
1 ASM REA Sees Ot. are 
MMi icc eee oe) ee 
| a A Oo ie 
13, AAA ee i 47°] 
“The amount of cinnamaldehyde was found by ascertaining the 
percentage of non-aldehydes after separating the cinnamaldehyde 
by bisulphite of sodium. 
