SILK-WORMS. 
101 
thoroughly cleaned, the sheets of paper cleansed 
and rolled up, and taken out of the laboratory. 
If the substances remaining on the paper are 
examined, they will be found to consist of a mass 
of the fragments of leaves, and moist excrement, 
without any unpleasant effluvia, the weight of 
about seven pounds and a half. 
From the first day of the rearing of silk- worms 
until the first moulting they have consumed thirty 
pounds of leaves ; twenty-two pounds eight ounces 
of substance have contributed to the growth of 
these insects, or have evaporated. In the first 
age the worms void a small portion of excrement, 
resembling fine black powder ; of the seven 
pounds eight ounces of substance there are only 
about ten ounces of excremental matter. 
Second Day of the Second Age. 
(Seventh of the Rearing of the Silk-worm.) 
This day will be required about thirty pounds 
of chopped leaves ; this quantity, divided into 
four portions, should be given at intervals of six 
hours ; the two first meals less plentiful than the 
two remaining. It is very necessary gradually to 
widen on both sides the strips in which the worms 
are distributed, that at the close of the day two- 
thirds of the allotted space should be covered. 
The body of the worm now acquires a clear 
hue ; the head enlarges and becomes whiter. 
