150 
THE ART OF REARING 
1st. The vapour, in spreading, immediately 
destroys any unpleasant effluvia. 
2d. It diminishes the fermentation of the litter, 
and dries it up. 
3d. It neutralizes the effect ofall the miasmata, 
and deleterious emanations that might attack the 
health of the silk-worms. 
4th. It revives the silk-worms, gently stimulat- 
ing them, because it is composed in a great mea- 
sure of pure vital air. 
5th. This vapour is not alone favourable to the 
health of the silk-worms, but influences the good- 
ness of the cocoon, as I have experienced. 
If the laboratory is small, the remedy will be 
in smaller proportions, and therefore cost. less. 
3. Of the Manner of easily Drying the Leaves , 
even in rainy Weather. 
Silk-wcrms consume such a large quantity of 
leaves in the fifth age, that if we do not try to 
overcome the difficulties in time, we might find it 
difficult, by reason of the atmospheric variations, to 
procure a sufficiency of dried leaves for their food. 
Although we have not frequently heavy and 
continued rain in the month of June, I have how- 
ever seen unceasing rain for three days at the lat- 
ter end of this month, particularly in 1813, and 
at the moment of the chief consumption of the 
leaves ; and I observed that such an accident might 
