SILK-WORMS. 
229 
from 18 to 20 square feet; and if they are 22 
or 23 inches broad, this superficies can contain 
more than 60 ounces of eggs. The more perpen- 
dicular the lateral parts of the tressel are, the less 
soiled will be the cloth by the evacuation of the 
liquid matters that come from the moths. 
As many tressels must be arranged as will be 
required for the quantity of eggs to be collected. 
And I repeat here, that 28 ounces of cocoons 
give two ounces more eggs, when the moths 
which come from them are well chosen. (Chap. 
XIV. 
In thus disposing the moths, they have access 
to the air on all sides, and can be easily handled, 
that is placed, and replaced, as occasion may 
require, on all the points of the cloth. 
When every thing has been thus arranged, 
recollecting that the room should be dry, from 
which all light should be excluded, except what 
is necessary to see what you are about ; the moths 
that have been united six hours are to be gently 
separated, the females to be placed on the frame, 
and carried on linen to the room where the tressels 
are, and placed there one after the other, begin- 
ning at the top of the tressel, and going down- 
wards. This operation must be continued without 
intermission, as long as you find females that have 
been united during the necessary time. 
The time must be noted at which the moths 
