371 
progression, 90 that a single one may in one year be the mo¬ 
ther of more than a million of individuals of her own species. 
This prodigious fruitfulness shows the necessity of attending 
to the destruction of these insects, which are capable of ra- 
vaging all our fruit trees.” 
It is a fortunate circumstance for the cider grower, that the 
caterpillar serves for food to many sorts of birds. The ashes 
and smoke of sea-weed, tar water, the decoction, the powder, 
and smoke of tobacco, flower of sulphur, quick lime, and 
plaster of Paris, pulverised, and the like, destroy it. 1 have 
been assured, that the elder with its leaves on, keeps it at a 
distance. 
There is here an additional reason for using the composi¬ 
tion recommended in the Fourth Chapter, to be applied to 
young trees lately transplanted, on which this insect throws 
itself preferably to all others. 
All that I can say as to the efficacy of this composition, is, 
that caterpillars have never attacked those apple and pea^r 
trees of mine, to which it had been applied. 
UP A PTE R 
