SILK-WORMS. 
323 
Deducting 1551bs. 7oz.4drs. from '7451bs. 8oz., 
there will remain 5901bs. 4drs. of vegetable sub- 
stance, namely, in stalks, fruit, fragments of 
leaves, &c., not eaten by the silk-worms; and sub- 
tracting the 5901bs. 4drs. of leaves from 13621bs. 
that had been laid on the hurdles, it will appear, 
that the worms have only really consumed 771 lbs. 
7oz. 4drs. of pure leaves. 
From the above statement it ensues, 
1. That to obtain a pound and a half of co- 
coons, it requires about 201bs. 4oz. of leaves, as 
gathered from the tree : and that it requires 
16091bs. 8oz. to obtain 120 pounds of cocoons, 
which an ounce of eggs should yield. 
2. That this quantity of leaves gathered from 
the tree, deducting 1421bs. 8oz. of refuse and sort- 
ing, and 1051bs. of decrease, by means of evapo- 
ration, it only requires 161bs. 8oz. of pure leaf, 
per pound of cocoons, or 13621bs. for 1201bs. of 
cocoons. 
3. That subtracting from the 13621bs. the 
5901bs. 4drs. of residue, such as little branches, 
stalks, fruit, Sfc., which were taken off the hurdles 
with the litter, 9flbs. of pure leaf have been suffi- 
cient to obtain 1 Jib. of cocoons, and consequently 
771 lbs. of leaves effectually eaten have sufficed to 
obtain 1201bs. of cocoons. 
4. That the 13621bs, of leaves distributed on 
P 6 
