326 THE ART OF REARING 
4. Facts relative to the Increase and Decrease of 
Silk-worms, in Weight and Size. 
PROGRESSIVE INCREASE. 
gr. 
Hundred worms just hatched, weigh about . 1 
After the first moulting 15 
After the second moulting 94 
After the third moulting ..... 400 
After the fourth moulting 1628 
On attaining the greatest size and weight . . 9500 
Thus have they in thirty days increased 9500 
times their primitive weight. 
lines. 
The length of the silk-worms when just hatched is about 1 
After the first moulting its length is . . . .4 
After the second moulting . . , . .6 
After the third moulting 12 
After the fourth moulting 20 
After the fifth moulting many attain the length of . 40 
The length of the silk-worm is thus increased 
forty times in twenty-eight days. 
PROGRESSIVE DECREASE. 
gts. 
1 00 silk-worms when arrived at the highest state of 
maturity, size, and perfection, weigh . . 7760 
100 chrysalides weigh 3900 
100 female moths weigh 2990 
100 male moths ....... 1700 
100 female moths having deposited their eggs . 980 
100 female moths dying naturally, after having laid 
the eggs, and nearly quite dried . . . 350 
In the space of twenty-eight days more, the silk- 
worm has diminished, or lost, thirty times its own 
weight. 
