INSECT POWDER. 
63 
duction of mineral matter during the grinding as a result of abrasion 
from the mill. In the case of stone mills there would be some wearing 
of the stones and a small amount of material would be introduced 
into the powder in this way. It can readily be seen, however, that 
if this were sufficient to increase the ash content appreciably, say, 
1 per cent, there would soon be nothing left of the mill. 
In order to determine whether there was any marked difference in 
the composition of the powder from that of the flowers from which 
it was made, a number of samples of "closed" Japanese flowers were 
collected immediately before entering the mill and samples of the 
ground product as it came from the mill. Owing to the great capac_ 
ity of the milling and sieving machinery, the powder from any par- 
ticular sample of flowers could not be identified, but when collected 
over a period of a working day an average of all samples collected 
should be representative of the material. In Table 41 are given the 
analyses of these samples, which represent a run of about 60 bales 
(25,000 pounds) of "closed " Japanese flowers. Table 42 contains the 
results of analyses of Japanese stems before and after grinding. 
Table 41. — Analysis of Japanese " closed"'' flowers before and after grinding. 
Flowers. 
Powder. 
Nitrogen, 
N. 
Ash. 
Ash in- 
soluble 
Nitrogen, 
N. 
Ash. 
Ash in- 
soluble 
in HC1. 
in HC1. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
1.96 
6.75 
0.28 
1.735 
6.77 
0.53 
1.66 
6.95 
.32 
1 
705 
7.15 
.74 
1.82 
6.85 
.65 
1 
89 
6.56 
.45 
1.78 
6.67 
.29 
1 
84 
7.19 
.77 
1.72 
6.92 
.68 
1 
88 
7.61 
1.21 
1.76 
7.09 
.79 
1 
76 
7.40 
1.00 
1.77 
7.01 
.74 
1 
77 
7.47 
.94 
1.79 
6.88 
.47 
1 
74 
7.47 
.92 
1.80 
7.15 
.82 
1 
81 
7.53 
1.03 
1.94 
7.43 
.97 
1 
65 
6.84 
.82 
1.76 
7.70 
1.21 
1 
81 
7.75 
1.07 
1.73 
7.19 
.77 
1 
73 
7.48 
1.04 
1.82 
7.39 
.97 
1 
85 
8.23 
1.45 
1.76 
6.96 
.60 
1 
77 
7.71 
1.09 
1.81 
7.40 
.98 
1 
68 
7.50 
.99 
1.81 
7.26 
.81 
1 
73 
7.72 
1.31 
1.88 
7.33 
.79 
1 
79 
8.58 
1.82 
1.84 
8.58 
2.03 
1 
70 
7.4? 
1.U6 
1.84 
7.72 
1.11 
1 
79 
7.37 
.86 
1.91 
7.46 
.89 
1 
76 
8.97 
.64 
1.87 
7.50 
.94 
1 
87 
815 
1.33 
1.82 
7.63 
1.05 
1 
80 
8.19 
1.64 
1.81 
7.84 
1.22 
1 
76 
7.44 
1.04 
1.80 
7.72 
134 
1 
76 
7.57 
1.15 
1.90 
8.22 
1.83 
1 
79 
7.81 
1.29 
1.70 
7.28 
1.04 
1 
77 
7.43 
105 
1.93 
7.26 
1.07 
1 
77 
7.64 
1.27 
1.90 
8.31 
1.77 
1 
73 
7.56 
1 14 
1.91 
7.82 
1.36 
1 
77 
7.55 
1.13 
1.98 
7.68 
1.15 
1 
77 
7.42 
1.12 
1.87 
7.59 
1.05 
1 
80 
7.93 
1.46 
1.84 
7.37 
.99 
1 
80 
7. 59 
1.10 
1.91 
7.12 
.76 
1 
52 
6-59 
.81 
1.77 
7.22 
.94 
ii.S3 
17.42 
. il.OO 
1 1.77 
17.54 
11.10 
1 Average. 
