III. Diseases, not generated in the eggs, arising 
from defective management, are caused — 
First — By placing the worms too thick on the 
trays, thereby hindering them from feeding comfort- 
ably. 
Second — By not keeping the air dry and in 
constant circulation. (This impedes the breathing, 
and causes the leaves on the trays to ferment. If 
this is continued, it will make the worms unhealthy, 
and probably cause their death.) 
Third — By giving the mulberry leaves to the 
worms when not sufficiently dried ; for water is fatal 
to silkworms. 
TJiese can be prevented — 
First — If the worms are evenly distributed on 
the trays, and are not too much crowded. 
Second — By renewing the air, and keeping the 
cocoonery dry. 
Third — By drying the leaves thoroughly before 
giving them to the worms. 
It may also be appropriate in this connection 
to state — 
First — That keeping the cocoonery light is of 
great benefit to the worms. 
Second — That keeping some purifier, such as 
charcoal or chloride of lime, in the room, will pre- 
vent a great many of the diseases of silkworms. 
