First — When the room where the moths are 
laying eggs is damp, the evaporation will be very 
slow and the eggs will not become dry enough. 
Second — When the place where the eggs are 
kept during the winter is damp. 
No diseases will occur if the eggs are kept dry. 
II. Diseases in consequence of the tempera- 
ture not being regulated properly will occur — 
First — When the eggs that are about to hatch 
are suddenly exposed to any great change of tem- 
perature, either warmer or colder. 
Second — When the worms that are just hatched 
are brought suddenly into a much higher tempera- 
ture ; for the greater the degree of heat the greater 
will be the evaporation, and this will affect the 
delicate organs of the newly hatched worm very 
severely. 
The first organs affected by the diseases pro- 
ceeding from the causes above enumerated are the 
reservoirs containing the silk ; and should they 
become very greatly affected, the worm will usually 
die before reaching the time for spinning its cocoon. 
These diseases can never happen — 
First — If the worms are kept in an even tem- 
perature; and 
Second — If, in removing the worms, they have 
not been exposed to draughts of damp air. 
