Restoration of the Silkworm. 173 
The mode of doing this is as simple as could be wished. 
Nature, ever watchful over the welfare of her productions, herself 
points out the course to be pursued, and invites us to profit 
by her wise suggestions, when she gives us so broad a hint of the 
true state of affairs as to place before us in almost every brood 
of domesticated worms a few dark individuals, as if for the 
express purpose of attracting and fixing the naturalist’s attention, 
and compelling him to adopt a method of perpetuating that dark 
race. Let the sericulturist separate these from his general stock, 
and set them apart for breeding from; let him annually weed 
them of all pale-coloured worms, and in the course of three or 
four years he will be enabled to cast aside his present sickly 
colourless stock, and rejoice in the acquisition of a worm far 
healthier than ever it has been since the day when it was first im- 
ported from the east by the enterprising monks to whom we are 
indebted for its introduction into Europe. 
