SILK-WORMS. 245 
grafted mulberry, to yield the same quantity. 
(Chap. XIV.) 
2. That 74lbs. of cocoons, proceeding from 
silk-worms fed on the leaves of wild mulberry, 
give about fourteen ounces of exceedingly fine 
silk ; whilst generally the same weight of silk- 
worms, managed exactly in a similar manner, but 
fed with leaves of the grafted mulberry, only 
yields eleven or twelve ounces of silk. 
3. That the silk-worms fed on the wild leaves 
are always brisker and have better appetites. 
These facts then prove, that the leaf of the 
wild mulberry, compared to the grafted mulberry, 
yields, at equal weight, a greater portion of nu- 
tritious and resinous substance, and less of the 
fibrous substance. 
I said just now, that I spoke of the leaves, 
that they were just gathered and not sorted ; be- 
cause the total weight that is drawn from the 
tree must be reckoned, as it is purchased in the 
gross, and not sorted until after the weighing and 
purchase. (Chap. XIV.) 
The fruit of the wild mulberry weighs less than 
the grafted fruit, particularly if the grafted tree 
is old and the leaf ripe. 
Dividing a quantity of leaves of the grafted 
mulberry, which were sold as being 1501bs. weight, 
into 100 parts, I myself separated 28 portions of 
