SILK-WORMS. 319 
average, 47 grains per ounce, which is equivalent 
to of their total weight. 
The weight of the shells of the eggs, after the 
hatching of the worms, amounts to 116 grains per 
ounce, which is about ^ of the total weight. 
Consequently, the loss of weight of the eggs in 
the stove-room deducted, and the weight of the 
shells, 54,625 silk-worms just hatched make an 
ounce, while to make that weight 37,168 eggs 
were sufficient. 
Thirty-nine thousand silk-worms, proceeding 
from one ounce of eggs, can eat the first day, and 
lie easily in a space of about 20 square inches. 
2. Facts relative to the Extent of Space which 
should be occupied by the Silk-worms in their 
different Ages. 
The worms proceeding from one ounce of eggs 
should have a space, — 
In the first age, of seven feet four inches square. 
In the second age, of fourteen feet eight inches. 
In the third age, of thirty-four feet, six inches 
square 
In the fourth age, of eighty-two feet six inches 
square. 
In the fifth age, of one hundred and eighty -three 
feet four inches square. 
As the silk-worm rises in the fifth age, I would 
here willingly state the weight of the materials 
