288 
THE ART OF REARING 
obtains in the common manner of managing silk- 
worms. 
Are there not, besides, many proprietors, who 
might arrange, with very trifling expense, such 
places as garrets, warehouses, &c., so as to be on 
a good plan for the rearing silk-worms ? 
Can any liberal proprietor, who has informed 
himself upon the improvements I have suggested 
in the art of rearing silk-worms, state whether 
he does not think that from ten ounces of good 
well-preserved eggs we may easily draw 150, and 
even 300 pounds of cocoons beyond what may be 
procured in the bad and ordinary manner of 
managing silk- worms. 
This interest, derived from such an amount of 
capital, is still very trifling, when compared 
with the other manifold advantages which the pro- 
prietor will derive from the erection of a labo- 
ratory. To be convinced of this, it is only ne- 
cessary to observe, — 
1st. That the erection of laboratories tends to 
increase the value of the lands in which they are 
erected, and from which the leaves are procured, 
because they afford a greater produce in cocoons; 
as land which, when well- worked and dressed, 
gives eight for one, is more valuable than land 
which will only yield six. 
2d. That in uniting in the same establishment 
