SILK-WORMS. 
223 
3000 grains. It is therefore unnecessary to point 
out other characters to distinguish the males from 
the females : besides, the male which is single 
beats about its wings at the approach of the least 
light. 
For reasons which I shall afterwards point out, 
the hour must be noted at which the tables con- 
taining the united moths were placed in the dark 
chamber. The same ought to be done with respect 
to the other little tables with the moths that after- 
wards unite. 
If, after this operation is over, there still remain 
some moths of each sex, they are to be placed in 
the small perforated box, (Fig. 27.) until the 
moment favourable for their union comes. 
From time to time, they must be looked at, to 
see if they separate, in order that they may be 
brought anew into contact. When any thing is to 
be done in the dark chamber, as little light as pos- 
sible must be admitted, only sufficient to distin- 
guish objects. The more light there is, the more 
are the moths disturbed and troubled in their 
operations, as light is too stimulating for them. 
The moth of the silk-worm belongs to tha,t 
kind that fly by night, and which we often see 
flitting round lighted candles ; where they are 
called Phalenes, or night-butterflies, to distinguish 
them from those which fly by day, called in con- 
sequence day-butterflies. The boxes (Fig. 27.) 
