SILK-WORMS. 
287 
3d. Of the proper place for the preservation 
of the leaves. 
4th. Of the utensils. 
1. Of the Laboratory of the Proprietor. 
It is a certain fact, that men scarcely ever em- 
ploy capital excepting in the manner most likely 
to bring in rent, or interest in money, pointed 
out by habit and local circumstances, with the 
further exception of the expenses of luxury, &c. 
For instance, if a proprietor purchase fifteen 
or twenty acres of land, which cost him three 
or four thousand francs, it is with the view of 
drawing 150 or 200 francs from it. 
Admitting this j^osition, it is clearly evident, 
that if we can prove to the proprietor that in 
employing capital to the amount of three thousand 
francs in constructing a laboratory of silk-worms, 
he would derive more than five per cent., we 
cannot doubt that he would endeavour to 
do so. 
To be able to say, with assurance, that it is 
profitable to construct a laboratory for silk- 
worms, I shall only make one observation, which 
is, that to draw 150 francs from 3000 francs 
capital employed in erecting a laboratory, it 
would be sufficient, that the proprietor received 
90 pounds of cocoons more than he annually 
