VIII. Tobacco in every form should be kept 
away from the cocoonery, and much caution must 
be taken to keep it free from rats, mice, birds, and 
insects. 
IX. Most of the diseases to which silkworms are 
liable are caused by foul air, dampness, or defective 
management. Charcoal or chloride of lime should 
always be kept in the cocoonery, and must occa- 
sionally be renewed. 
X. The amount of leaves consumed by the 
produce of ^ oz. eggs (about 10,000) is as follows : 
During the first age 
second 
age 
third 
a 
fourth 
u 
fifth 
a 
iy 2 
fbs. 
AV2 
u 
is 
it 
45 
it 
274^ 
u 
XL The temperature during the caterpillar 
period must not be allowed to fall below 70 ° Fahr., 
but should be kept above that point by artificial 
means ; should the air become too hot, its temperature 
may be lowered somewhat by sprinkling the floor 
with w 7 ater,but the worms ought never to be deprived 
of the great benefits arising from keeping the air 
continually in circulation throughout the rearing 
apartment. The temperature should be maintained 
as even as possible, as any sudden change is disas- 
trous to the health of the worms. 
