60 
THE ART OF REARING 
2. Of the removal of the new-hatched Silk-Worm 
into the Laboratory , or elsewhere. 
The silk-worms should be removed as soon as pos- 
sible into the laboratory, in which they are to 
their two first stages by a few days. To obtain this, the 
only method is, after the worms have been removed into the 
laboratory about' five hours, to lower the temperature to 
73 3 from 75° ; four hours after, further to lower it to 71°, 
and the following day to 6S°, if necessary. 
This cooling of the air diminishes the hunger of the young 
6ilk-worm by degrees, and without danger; and by these 
means the modifications are prevented, which, at 75°, would 
have brought on the casting, or moulting, much more 
speedily. 
At 75°, the first moulting is effected the fifth day; whilst 
at 71°, it requires six or seven days. The second moult- 
ing, which at 75° is wrought in four days ; at 69° and 
71°, takes six days for its accomplishment. Thus, by 
foresight and prudence, the proprietor will be enabled to 
gain seven or eight days, which prevents any ill effect from 
the unfavourableness of the season ; and this time gained, it 
is evident, may be of the utmost consequence. The tables 
I have annexed, at the end of this volume, will shew that, in 
1S13, the silk-worms were reared in thirty-one days, and that 
it required thirty-eiight days to raise them in 1814, to allow 
time for the growth of the mulberry -leaf ; and I do not 
comprise in these seven days which I gained, three days 
which I delayed in the hatching of the silk-worms, having 
perceived that the whole season was bad. Those who are 
not careful thus to meet the accidental untowarduess of sea- 
sons, and by art to prevent their injuries, would be obliged 
either to throw away the early-hatched eggs, or to strip the 
mulberry-tree too soon, and injure the leaves which are to feed 
