April, ’24] 
headlee: dusts for stored seed insects 
301 
clay to 50 parts of com by weight. This study does not show the 
minimum dosage. 
The effect of mixing Milltown Ball Clay No. 9 with wheat and then 
examined and the results are set forth in tables 5 and 6. 
Table 5. Effect of Mixing Milltown Ball Clay No. 9 (200 mesh) with 
Wheat and Seeding with One and Two Pairs of the Angoumois Grain Moth. 
Temperature 80° F. 
and Humidity 73.4% (1922). 
Composition of 
Days from 
No. of 
No. of 
No. of 
the mixture 
introduction 
moths 
wheat 
grains 
Clay in 
Wheat in 
to 
introduced 
found 
grains 
infested 
parts by 
parts by 
examination 
weight 
weight 
1 
1 
29 
4 
4 
1300 
0 
5 
1 
28 
4 
4 
1300 
0 
10 
1 
30 
4 
4 
1300 
0 
15 
1 
32 
2 
9 
Jmj 
1300 
0 
20 
1 
33 
2 
2 
1300 
0 
30 
1 
35 
2 
2 
1300 
0 
40 
1 
35 
4 
4 
1300 
0 
50 
1 
36 
9 
2 
1300 
0 
Check 
44 
4 
72 
1300 
48 
Table 6. Effect of Mixing Milltown Ball Clay No. 9 with Already 
Infested Wheat. Temperature 80° F. and Humidity 73.4% (1922) 
Composition of the mixture 
No. of moths 
No. of parasites 
Parts of Clay 
Parts of Clay 
emerging 
emerging 
by weight 
by weight 
4 
1 
9 
Lj 
2 
3 
1 
3 
0 
2 
1 
6 
0 
1 
1 
4 
0 
1 
2 
3 
0 
1 
3 
8 
0 
1 
6 
5 
1 
1 
8 
9 
5 
1 
16 
12 
0 
Check 
5 
26 
Thus it appears that mixing wheat with Milltown Ball Clay No. 9 at 
the rate of 50 parts to one by weight affords perfect protection. The 
minimum dosage did not appear in this study. It further appears 
that comparatively large dosages of clay slightly reduced the infestation 
itself. 
From the data recorded in tables 1 and 2 it seems obvius that when 
common white beans are mixed with ground burned lime (CaO), Calcium 
chloride (CaCl 2 ), hydrated lime (Ca(OH) 2 ) and Milltown Ball Clay 
