242 
THE ART OF REARING 
li lbs. of tlie common cocoon. And'even this ad- 
vantage is even less in the climate of Lombardy 
because, 
1 . In the first place, the silk of these cocoons is 
coarser and not so pui'e, (Chap. XIV.), which 
explains the reason why these worms consume 
fewer leaves. 
2. These worms are five or six days later, in at- 
taining their utmost growth, and in rising, than 
the common silk-worm. 
3. The cultivator runs the chance of stripping 
the mulberry-trees later, and injuring them. 
4. The labourers must be kept on longer, which 
incurs expense. 
5. The insects are exposed to more risk and 
danger, as their life is longer. 
Consequently, this variety in the species does not 
suit the climate and regions similar to those in 
which I live ; but they may possibly answer bet- 
ter in warmer climates and in different circum- 
stances. 
3. Of the Worms that produce White Silk. 
I have reared a large quantity of this species, 
separately, and found them in all things equal to 
the common silk-worms of four casts. 
But the white cocoons they produce ought to 
sell much higher than any others, because it is, 
undeniably, more valuable than the yellow silk. 
