655 
December, ’24] shedd and olney: tobacco extracts 
Table 3—Percentage of Nicotine and Total Nitrogen in Air-dried Common 
Trash, Infected with Wildfire. 
Appreciably infected 
Badly infected 
Max. 
Min. 
Ave. 
Max. 
Min. 
Ave. 
Leaf including stems. Nicotine. 
. . . 2.93 
0.68 
1.32 
1.27 
0.69 
0.94 
Total nitrogen. 
. . . 4.35 
2.23 
2.96 
4.20 
2.56 
3.46 
Composite of samples above with stem 
re- 
moved. Nicotine. 
1.84 
1.21 
Total nitrogen. 
3.37 
3.98 
It will be observed in Table 3 that the badly infected tobacco has less 
nicotine but more nitrogen than the other and that the removal of the 
stem increases the average amounts of these constituents in both kinds 
of tobacco. 
It was impossible to obtain for the spray work a sufficient number of 
samples of diseased dark tobacco, therefore those that were used repre¬ 
sent a better quality than would be employed for this purpose. 
If general recommendations were to be made based on the results 
reported here together with a large number of nicotine determinations 
on other grades of both kinds of Kentucky tobacco, it would probably be 
safe to assume that such Burley as might be used for spray solutions 
would contain about 1 per cent, and dark tobacco about 1.70 per cent of 
nicotine. 
Any sample which is to be used for the preparation of a spray solution 
should be rendered as fine as possible so as to permit a more thoro extrac¬ 
tion. In no case, however, will a complete solution of the nicotine prob¬ 
ably be obtained under practical working conditions. Of course the 
judgment of the user would prevail as to whether any lot of tobacco 
could more profitably be used in a spray solution but in arriving at a 
decision it must be remembered that a considerable proportion of the 
fertilizing ingredients still remains in the residue after the extraction of 
the nicotine and this may be used as a fertilizer. 
Summary 
The only grade of Kentucky tobacco, other than stems and stalks, 
which can be used profitably at present prices for making a spray solu¬ 
tion is common trash. This is chiefly composed of diseased and damaged 
leaf. It has a widely variable and generally low nicotine content but 
usually contains more than stems and stalks of the same variety. The 
range for 79 samples of white Burley and dark tobacco analyzed is from 
0.26 to 4.50 per cent. 
Angular leaf-spot and wildfire lower the nicotine content but not the 
nitrogen content of the leaf. The nicotine content of the leaf which 
