EFFECT OF CULTURE AND CLIMATE ON PEPPERMINT OIL. 9 
Table V. — -Comparison of the physical properties and the chemical composition of pepper- 
mint oils distilled from the fresh leaves, from the tops, and from the entire fresh herb at 
the various stages of growth. 
Physical properties. 
Chemical composition (per 
cent). 
Year and descrip- 
tion of material. 
Color, odor, and taste. 
Specific 
gravity. 
Rota- 
tion, 
50 mm. 
tube. 
Refrac- 
tion. 
Solubil- 
ity in 
80 per 
cent 
alcohol. 
Free 
acid 
(as 
acetic). 
Ester 
(men- 
thyl 
ace- 
tate). 
Menthol. 
Free. 
Total. 
1909. 
Budding stage: 
Herb 
Golden yellow; 
pleasant, faint 
odor; slightly 
pungent, cooling 
taste. 
Straw colored; frag- 
rant but faint 
minty odor; fatty, 
pungent, slightly 
bitter taste. 
Straw colored; very 
fragrant minty 
odor; fatty, bitter, 
pungent taste. 
Pale yellow; agree- 
able menthol-like 
odor; pungent, 
minty taste. 
Straw colored; pleas- 
ant, minty odor; 
pungent taste. 
Straw colored; flow- 
,ery odor; pungent 
taste. 
Straw colored; very 
flowery odor; 
minty, pun gent 
taste. 
Golden yellow; 
pleasant, minty 
odor; minty. pun- 
gent taste. 
Light straw colored; 
pleasant, flowery 
odor; minty, 
slightly pungent 
taste. 
Dark golden; not 
fragrant, minty 
odor; slightly bit- 
ter, pungent, 
minty taste. 
Golden yellow; faint, 
not especially 
minty odor; 
slightly bitter, 
pungent taste. 
Golden yellow; 
agreeable, minty 
odor; strong, pun- 
gent, bitter, cool- 
ing taste. 
Pale yellow; mild, 
agreeable odor; 
fatty, strong, cool- 
ing, pungent taste 
<xO. 9158 
a. 9143 
a. 9151 
a . 9203 
a . 9389 
a . 9370 
a . 9151 
a. 9373 
a. 9223 
g . 9155 
g . 9156 
-9.2 
-12.1 
-12 
-10.6 
-11 
-10.3 
-8.3 
-9.6 
-9.5 
-12.1 
-13.1 
&1.4738 
61.4713 
61.4718 
61. 4662 
61.4706 
61. 4732 
61.4676 
61. 4730 
61. 4723 
ol.4718 
O1.4710 
Volumes. 
el 
0*1.4 
el 
fl.2 
/1.2 
11 
e.8 
o"l. 5 
el 
h.7 
0.10 
.014 
.116 
.21 
.52 
.48 
.10 
.32 
.16 
.86 
.90 
.13 
.03 
6.72 
9.9 
8.84 
7.07 
17.3 
15.9 
12.37 
19.8 
15.56 
16.62 
19.80 
13.44 
11.67 
30.1 
37.7 
31.8 
46.5 
41.7 
37.75 
33.8 
37.58 
34.8 
43.76 
18.79 
29.19 
30.94 
35.39 
Leaves 
Tops 
45.67 
38.76 
Flowering stage: 
Herb 
52.09 
Leaves 
Tops 
55.38 
50.29 
Fruiting stage: 
Herb 
43.58 
Leaves 
Tops 
53.18 
47.08 
1910. 
Budding stage: 
Herb 
56.85 
Leaves 
Tops 
34.39 
39.78 
Flowering stage: 
Herb 
0.9273 
-5.7 
ol. 4820 
d.66 
40.13 
a At 22° C. 
6 At 25° C. 
c Clear in excess. 
d Turbid in 3 volumes or more. 
e Turbid in 1\ volumes or more. 
/ Turbid in 2 volumes or more. 
g At 24° C. 
h Turbid in 4 volumes or more. 
