352 
APPENDIX. 
which the soil affords. Seven hundred and thirty-two 
mulberry-trees will cover about 2928 square feet of 
land, which cannot be sown or made any other use 
of. If the land be good, on which the trees stand, 
such as would yield a quarter and a half of wheat, or 
twelve bushels, it would be, on an average year, a 
loss of sixteen francs. 
Next, suppose that the price of the mulberry-trees, 
and other costs of plantation, come to two francs ; 
732 mulberry-trees will cost 1464 francs, the in- 
terest of which sum is about 73 francs. 
As we must allow a loss of four per cent, on the 
mulberry-trees that die, we should add about fifty- 
nine francs, which must be reimbursed to the proprie- 
tor before he clears his account. 
From this calculation, the proprietor ought to obtain 
annually, 
Francs. 
Ground rent . . . . . 16 
Interest of capital employed . . 73 
Casualties, loss and re-planting of the trees 59 
148 
For the value of this sum, the proprietor will re- 
ceive each year 750 pounds of cocoons. Supposing 
he had no mulberry-trees on his land, and was 
obliged to plant, to obtain the required quantity of 
leaves, he would plant 1000 trees, wishing to keep 
up that number. The ground employed could bear 
nothing else, and would be of about 3600 square feet, 
equal to a loss of eighteen bushels of wheat, 120 
