28 o 
Journal of Agricultural Research 
Vol. VII, No. 6 
occurrence in poor-burning than in good-burning tobacco, as are also 
large, single crystals of grain substance and aggregates composed of large, 
platelike or flaky crystals. The cryptocrystalline haze is also much 
more prominent in the tissues between the relatively few definite grain 
bodies in the poor-burning tobacco. It will also be noted that no 
account is taken of the calcium oxalate or the single, scattered, acetic- 
acid-soluble crystals. The result of this method and the correlation of 
this result with apparently related factors are seen in Tables III and IV 
and figures i and 2. Corresponding data relative to the potash and 
chlorin content of the tobaccos are also included in the tables. 
Table III.— Data relative to the burning quality of tobacco from fertilizer treatments at 
Red Lion, Pa., crops of IQ13 and IQI4 
1913 
Treatment. 
Bum 
score 
(maxi- 
mum=> 20 
points). 0 
Fire-holding 
capacity in 
cigar.® 
Grain 
aggrega¬ 
tion 
(Maxi- 
mum= 20 
points. 
Original 
score 
Xa).« 
Potash 
content.® 
Chlorin 
content.® 
Potash- 
chlorin 
ratio.® 
Burning 
quality. 
Min. sec. 
Per cent. 
Per cent. 
I. 
13-3 
4 25 
5-4 
3 - 7 
I. 78 
2*3 
Poor. 
Ill. 
18. 0 
5 37 
13. 2 
4. 01 
• 
7 * 1 
Good. 
VII. 
17-5 
6 7 
12. 8 
4. 14 
. 64 
6. 7 
Do. 
IX. 
11. 0 
4 22 
7*3 
3*44 
2. 66 
i *3 
Poor. 
1914 
I. 
14 - 0 
4 
10 
5*7 
3. 61 
1. 38 
2. 6 
Poor. 
Ill. 
18. 0 
8 
0 
11.1 
3 * 42 
. 26 
r 3* 1 5 
Good. 
VII. 
18. 0 
6 
9*7 
3 * 57 
•23 
I 5*5 
Do. 
IX. 
12. 0 
3 
45 
4*3 
3 * 34 
2. 44 
1.36 
Poor. 
a Data furnished from report of cooperative work by Dr. William Frear, Chemist and Vice Director of the 
Pennsylvania Agricultural Experiment Station. The burn score and fire-holding capacity in the cigar 
were determined by Mr. Otto Olson, Assistant in Tobacco Investigations, Bureau of Plant Industry, and 
the determinations of the potash ana chlorin content and the potash-chlorin ratio were made by Mr. E. 
S. Erb, Assistant Chemist, Pennsylvania Agricultural Experiment Station. 
6 Data obtained by the writer and included in the report of Dr. W. W. Gamer on the portion of the 
cooperative work undertaken by the Office of Tobacco Investigations, Bureau of Plant Industry. 
In Tables III and IV and figures 1 and 2 the fire-holding capacity of the 
cigar has reference to the length of time a cigar made entirely of the 
tobacco in question remains lighted. The bum score includes the fire¬ 
holding capacity, amount of charring, character of ash, etc. 
In determining the fire-holding capacity of the open leaf the writer 
ignited separately each leaf of the sample with the glowing end of a piece 
of punk, and the number of seconds during which the fire glowed in the 
larger portion of the burning area was taken as the fire-holding capacity. 
