45 
* s ~The following quantities of menthol were obtained i in the most production districts 
of Japan: — 
| : 1912 1913 1914 
* Hokkaido . . . . 330000kin  530000kin 480000 kin | 
Bambi. ee tn 150000: 350000 _,, 130000 ,, 
Wainacatagiy ns eos 6000 ,, SOOO to 
Stearoptene (menthol) and oil were exported from oil a in the following quantities: — 
Stearoptene © Oil 
Weight ae Value Weight ea Value i 
Brore 2). 3s) 193.7970 kin) 1589729 yen 184885 kin 699250 yen 
UB SR pre ss faa. I ate 8 2872854 ,, 282:115'*5 10170678 ,, 
Meee 2. 2 269266 0, 1816096. .,, 277677 ,, 808809 __,, 
The amount, which the Kitami branch of the Agricultural Experimental Station in 
Hokkaido obtained with fopeier peppermint varieties in 1912, can be seen from the 
: following compilation: — 
L 
% 
3 
2 
Dried drug per tan Oil obtained therefrom 
(=j2/2 acre) Weight Per cent. 
Herb of English origin . . 12250 momme’) 426.0 momme 1.03 per cent. 
we aaerman -~";, o9. RW Ace Ot ey 63.5 aa Soa wns 
The yield in dried drug of the English variety has greatly diminished in com- 
parison with former times. The reason may perhaps be ascribed to weather con- 
ditions and insect damage. The oil yield from the drug of German origin according 
to the percentage content has auaeved the oils were weak brown and possessed the 
following constants: — 
oe Solubility in Combined Free Total 
des0 “D Np» 70p.c. alcoh. menthol menthol menthol 
_ Oil, English variety 0.9114 =+0° 1.4666 insoluble 5.22p.c. 56.65p.c. 61.87 p.c. 
Ps. German 0.9029 —24.75° 1.4647 be Pe 0.09 hs! (OorOO Rh 
4 . ' 
The oils are distinguished from the Japanese oil by their higher refractive index, 
by their insolubility in 70 per cent. alcohol and by their smaller menthol content. 
The oil of the Akamaru variety cultivated in Kitami was weak brown, but excelled 
the ordinary Hokkaido oil in taste and pleasant odour, and had the constants: — 
d.;0 0.8946, 4) — 38° 31’, npwo 1.4605, soluble in 2.8 vols. 70 per cent. alcohol, combined 
menthol 2.04 per cent., free menthol 74.47 per cent., total menthol 76.51 per cent. 
The product distilled from fallen leaves had the constants: — d,;0 0.9030, «a, — 
Np»o 1.4613, soluble in 2.9 vols. 70 per cent. alcohol, combined menthol 5.42 per cent., 
free menthol 78.32 per cent., total menthol 84.74 per cent. 
Japanese peppermint oil of the year 1912. — Oil samples were bought from manufacturers 
and export dealers. The samples obtained by the former had the following constants: — 
4 
: 
Solubility in Combined Free Total 
da50 op Npw° 70p.c.alcoh. menthol menthol! —_ menthol 
>see ohtae oil No. 1 0.8964 —36.00° 1.4597 2.7 vols. 1.58p.c. 74.93 p.c. 76.51 p.c. 
2 OB9AC -— 39099 11 ADIT 2 2k 4 69.52), 72.09. .., 
> SD eitesyania ae No. 1 U9 Ged? TADIS 4, 2, 52.305. 8473. 5 | 87.03 ,, 
i i PA ee tO EADS —2.8 5,00 Ele ag ty GOEL ia 87.034 \ 
” ” ” 3 
08992 —38,63° 1.4995 2.8 °,). 3.09 , . 80.48. ,, © 83.57. .., 
*) 1 momme = 3.7565 grammes. — 
