SILK-WORMS. 
147 
ing in some degree the poison which exhales from 
the fermented substances on the wicker hurdles, 
and to produce the desiccation of those that are 
inclined to ferment. I must first observe, that this 
remedy will not cost above 30 sous for a labora- 
tory of worms proceeding from five ounces of 
eggs. 
Take six ounces of common salt, mix it well 
with three ounces of powder of black oxyde of man- 
ganese; put this mixture in a wine-bottle, with two 
ounces of water, cork it well with a common cork. 
Keep this bottle in any part of the laboratory 
farthest from the stove or fire-places. In a phial, 
put a pound and a half of sulphuric acid, vulgarly 
called oil of vitriol, and put this phial near the 
other bottle, with a small liqueur glass, and ail 
iron spoon. And this is the manner of using it. 
Put into thesm all liqueur glass, two-thirds of a 
spoonful of oil of vitriol, pour it into the large 
bottle, and there will issue a white vapour. The 
bottle should be moved about through the labora- 
tory, holding it high up, that the vapour may be 
well spread in the air. 
When the vapour ceases, the bottle may be 
corked, and replaced; even should there be no 
perceptible difference between the interior and ex- 
terior air, during the fifth age of the worms, it is 
good to repeat this fumigation, three or four times 
a day, in the manner I have just explained. When 
H 2 
