89 
Experiments with the eggs of Tribolium 
confusum have shown that the size of bolting cloth which would re- 
Do 
remove the beetles only when it is possible to 
tain them depended upon the material adhering to the eggs (Tig. 
Tue Conrusep Flour BEETLE 
Sifting of flour will 
pass the material through a bolting cloth which is fine enough to ex- 
clude all stages of the beeties. 
2). 
a 
deol 
pte 
El 
Cow 
geee 
Time in Minutes 
eee EEE 
alelmielalalal 
LoS. 
| 
HH { FEEE Po, 
[ele | SSIES), 
eee 
EEEEeee 
al Pes. 
bya Le) 
eee 
PEE to 
EEE HI 
cS} 
T wel 
3 
Curves showing the rise of temperature in the top, center, 
| 
i 
Bet 
ree Sasa ot 
1 if 
7:17-Sm 
and bottom of 
s cold at the start, the cereal was 
s as low as it would burn for fifteen minutes. 
The oven wa 
Mires lay 
a pan of cereal heated in a gas oven. 
two inches deep in the pan, and the fire wai 
