INSECT POWDER. 
57 
amount of certain ingredients present in Pyre thrum flowers and stems 
aids the analyst to determine from the analysis of an unknown com- 
mercial insect powder whether or not it is adulterated with powdered 
Pyre thrum stems. 
By the color of the ether extract and by a determination of the 
nitrogen, phosphoric acid, and crude fiber, together with a micro- 
scopical examination, the presence of powdered stems in insect pow- 
der can be shown qualitatively and an approximate determination 
of the amount of stems can be made. 
Table 36 summarizes all the results for nitrogen, phosphorus pen- 
toxid, crude fiber, ash, ash insoluble in hydrochloric acid, pentosans, 
ether extract, moisture, and extraneous material, for stems and the 
three commercial grades of flowers, of both Dalmatian and Japanese 
origin. 
Table 36.— Summary of examination of insect flowers and stems. 
Product. 
a 
bo 
2 
d 
SI 
1 
4 
M 
4 
tOr-J 
w 
o 
1 
p* 
a* 
<C I-i+j 
tS©£ 
Ph 
i 
'8 
2 
c/5 
a 
5 
Per 
cent. 
1.61 
2.01 
1.813 
48 
1.53 
2.09 
1.759 
55 
1.53 
2.09 
1.784 
103 
1,40 
1.75 
1.566 
18 
1.17 
1.40 
1.267 
104 
0.610 
1.12 
.928 
12 
0.547 
.960 
.733 
6 
0.547 
1.12 
.765 
18 
Per 
cent. 
0.620 
.758 
.680 
15 
0.591 
.815 
.700 
19 
0.591 
.815 
.691 
34 
0.528 
.599 
.562 
4 
0.451 
.667 
.532 
94 
0. 125 
.411 
.326 
12 
0.117 
.345 
.192 
26 
0.117 
.411 
.234 
38 
Per 
cent. 
21.46 
24.70 
23.11 
15 
18.65 
22.89 
20.81 
12 
18. 65 
24.70 
22.09 
27 
27.20 
35.85 
31.02 
28 
32.39 
48.79 
44.38 
12 
33.54 
42.98 
37.69 
15 
32.39 
48.79 
40.66 
27 
Per 
cent. 
6.03 
8.58 
7.18 
48 
6.12 
8.28 
7.22 
55 
6.03 
8.58 
7.20 
103 
6.14 
7.95 
7.07 
17 
4.88 
7.87 
6.09 
104 
3.40 
6.24 
5.38 
12 
3.60 
6.70 
4.68 
26 
3.40 
6.70 
4.90 
38 
Per 
cent. 
0.19 
2.03 
.79 
48 
0.05 
.91 
.23 
55 
0.05 
2.03 
.49 
103 
0.12 
.74 
.31 
17 
0.06 
1.38 
.26 
104 
0.06 
1.69 
.95 
12 
0.09 
.59 
.29 
26 
0.06 
1.69 
.50 
38 
Per 
cent. 
Per 
cent. 
Per 
cent. 
Per 
cent. 
Per 
cent. 
Per 
cent 
Japanese "closed" 1™*"" " 
*™» Iav?:: 
No. samples examined. . 
Dalmatian "closed" J}}^-- 
flowers |av?;; 
No. samples examined . . 
16.06 
17.75 
16.66 
5 
5.99 
7.45 
6.87 
6 
3.05 
5.03 
4.11 
5 
4.40 
7.55 
5.37 
13 
0.57 
6.44 
2.72 
19 
0.11 
.75 
.30 
7 
(Japanese and Dal- ^Max.. 
No. samples examined. . 
|Min 
4.90 
6.44 
5.68 
4 
4.81 
9.21 
6.69 
17 
0.62 
5.05 
2.51 
8 
0.88 
4.99 
2.33 
45 
0.14 
.39 
.81 
No. samples examined . . 
jMin.. 
"Open" flowers <Max. . 
(Ave.. 
No. samples examined. . 
(Min 
19.98 
21.72 
21.11 
5 
5.09 
6.60 
5.81 
8 
3.50 
4.70 
4.06 
8 
4 
0.10 
.90 
.47 
9 
Japanese stems \ Max. . 
[Ave . 
No. samples examined. . 
[Min.. 
Dalmatian stems \ Max. . 
[Ave.. 
No. samples examined. . 
AllstemsfJapaneseandlvi' 1 *- " 
Dalmatian) j™;; 
No. samples examined . . 
17.54 
18.78 
18.21 
5 
2.34 
3.98 
3.22 
7 
1.53 
2.78 
1.97 
7 
4.51 
7.20 
5.40 
14 
0.38 
8.89 
3.93 
9 
In estimating the amount of stems in an unknown sample, its 
nitrogen and phosphorus pentoxid contents are compared with the 
