234 
THE ART OF REARING 
In 15 or 20 days, according to the different 
degrees of tempei-ature of the rooms, the eggs 
undergo almost all the gradations of colour men- 
tioned above, and possess then the characters of 
impregnated eggs. 
When all the operations of the 7th age are 
finished, there is nothing else to attend to, except 
the preservation of the eggs. 
I conclude this paragraph by observing, that 
in the 7th age, the impregnated female, which 
weighed then about 30 grains, in three or four 
days after having deposited its eggs, weighs only 
about 12 grains. When it is dead and dried up, 
its weight is only three grains and a half. 
3. Preservation of the Eggs. 
When the eggs have acquired the grayish colour 
peculiar to them in the impregnated state, and 
the linen cloths are quite dry, it is time to think 
of the means of preserving them. 
The linen cloths upon which the eggs are de- 
posited may be left there in the same place, pro- 
vided the heat of the room does not exceed 66° 
.or 68°. 
If the temperature of the room is higher, the 
linen cloths must be removed to a cooler place. 
At the extremity of the cloths which cover the 
shelves of the tressels, eggs are found detached 
