54 BULLETIN 824, U. S. DEPARTMENT OF AGRICULTURE 
TABLE 39.—Analysis of adulterated commercial insect powders—Continued 
ear , Ash in- 
ple Made in— DEE Ash soleus Color of ether extract Adulterants 
No. HCl 2 
Perch PR en Chae erce: 
17384 | United States__| 0.954 7.14 0: Shaul sGreenste2s 2 aun ee es All stems. 
1674207 | So dose . 856 5. 70 “O02 | = doa ese eee Do. 
A998 ae don sees . 947 5. 66 OGn |e {5 (oiglen ee cc pee Ses ge Stems. 
ESt5S a |e do 2 Seas . 849 7. 62 1 i Be encore Os eee eee ee All stems. 
1OKA5S |e G02 2522522 . 807 6. 36 .61 | Strong green__________ Stems. 
TOS4GE | eee GOs 1. 030 6. 69 129m) fee On eS aa Do. 
PAYA |e eae (0 (0s eee 1. 185 7.18 1.13 | Greenish yellow______- Do. 
2071 S86u| see COs se seee . 887 6. 06 SoC \OtLOn es Oreen ee sane Do. 
DISC wae Osean 1. 060 7.19 aif ECON So 522 ee eae eens Do. 
D193) eae Gore sete . 954 6. 16 GTS ae Get fA SRE ae Do. 
20940 |____- dO. Sees sie 4. 96 ST O9a| IStEOne: Sreen = ses a ao Do. 
FATE ee GOs ae 1. 145 10. 12 4,31 | Greenish yellow_______ Stems and sand. 
TPA |e dozens 1.015 6. 09 -405| Dirty: greenk 28022 as Potassium chromate and stemss 
ASTID | Eee (3 (0 ee pe . 786 Pell .66 | Strong green__________ All stems. 
23369 |=2 2. dons soa 1. 040 6. 57 . 80 1i( 572) d anya RE aes are Bn Stems. 
PAG AYN a ee (0 (at et a 1. 165 6. 75 Alo ay | pees OE ee a aoe Do. 
FAG) eee doo eee sas 1. 090 7.05 SOs OS 2 aes. vies Do. 
PSO) ae dos2 Shee 1. 050 8. 68 SiS apes GOS 2. ees oat ee Stems and sand. 
24168) 225" Goya ne 1. 120 7. 00 Bel (i\=| Wiesanes (9 Co peep aie Ela elie Stems. 
24769 |___-- dolce ees . 898 6. 38 .69 | Strong green__________ Do. 
Do04on asa (0 (pe, a ee 1.170 6. 10 . 82 TCC ho ee ee Do. 
TaBLe 40.—Analysis of commercial powders containing stems, amounts declared, 
made from “‘open”’ 
Sample No. Nitropen, P205 
Per cent | Per cent 
119/08 Reet ree 58 renee eee eM Be ec Rs 0. 891 0. 289 
flowers and siems 
Stems calculated 
Stems from— 
Paes Mean Error 
present pee: P20; 
Per cent | Per cent | Per cent | Per cent | Per cent 
75 75 78 +3 
From Table 40 it is evident that the amount of stems in commercial 
insect powder determined by the proposed method of calculation from 
the values for nitrogen and phosphorus pentoxid agrees within an 
average of less than 10 per cent of the amount declared to be present. 
In some cases the ash and acid-insoluble ash contents in insect 
powders have been found to be higher than they should be, based on 
those determinations made on samples of known purity and on 
samples of flowers and stems. 
Some jobbers have claimed that the 
high ash content of their product was due to the addition by the 
manufacturer of siliceous material during the grinding or to the 
introduction of mineral matter during the grinding as a result of 
abrasion from the mill. 
In the case of stone mills there would be 
ee eee 
a 
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