We have given some of the causes producing 
sickness in silkworms, and the means by which they 
may be prevented ; we will next give a description 
of the most common diseases arising from the 
aforenamed causes. 
I. THE YELLOWS. 
The yellows is probably the most common 
disease to which silkworms are liable. It is accom- 
panied by the following symptoms : 
First — The head of the worm swells ; 
Second — The skin is drawn tight over the rings 
of the body, making it look as if varnished ; 
Third — A yellow liquid is discharged, which 
may be observed on the leaves. 
When any worm becomes affected with this 
disease, it will avoid other worms, seeming to know 
that if a healthy worm should touch this yellow 
liquid it would become infected with the disease. 
As soon as any evidences of the yellows appear 
in any of the worms, the unhealthy should immedi- 
ately be removed, as the disease is very contagious. 
Remedy. — Sometimes, if the worm is not too 
far gone, removing it into purer air may restore it to 
health ; hence, the obvious cause of this disease is 
the impurity of the air. 
Persons living in the country, and raising silk- 
worms, must be careful not to throw any diseased 
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