SILK-WORMS. 
117 
space of this large laboratory should contain at 
least 917 feet square of wicker hurdle or table. 
Experience constantly demonstrates the advantage 
of having buildings proportionate to what is in- 
quired of them ; as much on account of economy 
of fuel, if the season were cold, as the convenience 
of attendance. There would certainly be no great 
objection, should there be two or three small 
contiguous buildings, instead of one large labo- 
ratory, so that they afforded an equal space. 
The only advantage that would thus be lost, 
would be the great facility enjoyed in a spacious 
building, of establishing, and maintaining, as we 
shall shew, constant and regular currents of 
air. (Chap. XIII.) 
When we have the use of a single space, large 
enough to contain the 917 feet square of hurdles 
necessary for the accommodation of the silk- 
worms proceeding from five ounces of eggs, it is 
beneficial to choose the most convenient part of 
the space, to place in it the 458 feet six inches 
square of wicker hurdles upon which the insects 
are to be deposited, until the accomplishment of 
the fourth age, afterwards to distribute them 
upon the whole space of 917 square feet. 
There is nothing so easy for those whose labo- 
ratories are well regulated, as to determine how 
the silk-worms are to be distributed in the 458 
feet six inches, on coming forth from their third 
