968 
Journal of Agricultural Research voi. xxiv.no. h 
The results obtained by the improved method on tobacco and extracts 
in comparison with Chapin's silicotungstic acid method, together with 
those found by the latter when variable amounts of alkali were used in 
the distillation, are given in Tables IV and V. 
Tabi,E IV .—Percentage of nicotine in tobacco {moisture free). 
No. 
Chapin’s silicotungstic acid 
method. 
Improved 
method. 
2 gm. NaOH 
used in steam 
distillation of 
5 gm. sample. 
ress than 2 gm 
NaOH used in 
steam distillation 
of s g*n. sample. 
61469 
7 - 55 
* 7 - 38 
6. 99 
* 7 - 29 
7. 01 
2 6. 90 
7. 00 
7.19 
61337 
6- 33 
" 5-98 
5 - 98 
6. 18 
6,08 
80073 
7-85 
* 6. 76 
6. 70 
7 - 83 
6. 88 
7. 84 
>6.65 
6. 79 
6. 71 
80074 
6-37 
^ 6. 19 
6. 01 
80076 
5 - 32 
^ 5 - 09 
4. 92 
80117 
3 - 67 
3-37 
80121 
3 - 97 
3.68 
80126 
2. 71 
2. 48 
80129 
4. 57 
4 - 43 
80130 
4 - 50 
4. 24 
80134 
I- 75 
I- 55 
80144 
^ 7 - 51 
7. 67 
80195 
^ 7-77 
7 - 83 
80263 
1 2. 56 
2. 57 
2. 58 
2. 58 
1 NaOH used in distillation, 0.25 gm. 
3 NaOH used in distillation, 0.15 gm. 
