| In taste ond mall ine Hokkaido oil is Ane slate if is vot a } 
the Okayama oil. The Sambi oil has a more bitter taste than the ar 
The oil samples purchased by the traders turned out as follows: ae es 
~ Solubility in Combined. — Free | 
des0 CBE ~ Mp0 70p.c.alcoh. menthol — ‘menthol 
Hokkaido oil No. 1 0.8951 —36.09° 1.4597 2.8 vols. 2.30p. c. 68. 02 p.. c. 
; bs Ape idl 2 ESO) — 35,109 J.4005°° > insok ~ O07 9) re “82 ane et 
Sambi oil No. 1 0.8965 —35.77° 1.4598 2.8 vols. 4.17 na - 70. 83 i 
aes ‘ ' 2 0:8963. —-30.50° 1.4505 28... 4-78) ae 76 a 
_ Hokkaido oil No. 2 was adulterated with Pies cent. ot a ee oil The Sambi ae 
The constants of Japanese peppermint ou me the year 1913 were as alone = — 
_ Solubilityin Combined — Free Gey 
dso “D Np2»° 70p.c.alcoh. menthol = menthol metinel” 
5 various oils om, gare? este erie 2.0 vole: eels Cc. a p.0.2 SGpe 
Okayama 0.8976 —39.25° 1.4597 3.4 vols. 5.72p.c. 84.71 p.c. 87.28p.c. 
to to to to to POW 
0.9014 —40.38° 1.4603 3.4 vols. 6.57p.c. 90.65 p.c.. 92.48 p. ee 
Oil from Hokkaido 0.8989 —36.55° 1.4590 2.7 , pe » 75.92 82.49 
9 various oils from { 9-8955 —36.25° 1.4589 2.7 vols. 1.83p.c. 76.07 p.c. 81.32 ee 
Hiroshima 
‘As a result of the investigations it appears that the: peppermint oil obtained i in, 
Japan from foreign varieties excels’ the native product in pleasant odour and taste. 
Since it is not to be expected that the English and German varieties will gradually — 
acquire the properties of the Japanese peppermint, the cultivation of these fore 
kinds may be profitable. 
The method pursued in Japan for the winning of menthol (freezing out might he a 
improved. The product from Japan designated as menthol-free oil, still contains 34 to 
44 per cent. menthol; this latter is extracted in Germany, and the residue iS put upon ¥ 
the market as dementholised peppermint oil. 
sh, SURE eh DOS hee me pet Peay 
Most of the peppermint oils, which in the course of the past report-year, were E 
laid before us for judgment, were adulterated, in which adulterations phthalic. ester 
and glycerin acetate repeatedly played the chief réle; so that what was said in out 
last Report (pp. 38 to 40) would have to be Mepeeten in the main, if we wished to 
enter into the details of our investigations. Here also the adulterations were chiefl 
recognised by the far too high ester number. Phthalic ester was used in comiparaity 
small quantities; on the contrary, additions up to about 33 per cent. were pro’ ed 
present in the oils adulterated with glycerin acetate. A peppermint oil treated wi 
the exceedingly easily soluble glycerin acetate, ought to be very soluble, and. 
significant of quality of the peppermint oil used as- “basis”, when an oil conta 
about 30 per cent. glycerin acetate did not completely dissolve in 10 volum 
70 per cent. alcohol, as was the case with one sample. % fn aia 
A new kind of adulterant was observed in a peppermint oil which Had: been. 
with phthalic ester. Apparently an effort had been made to improve. ‘the 
content and for this purpose areal ee had iene been used. on 
