THE APHID. 381 
the same, and so on until the ninth or tenth. Then the imperfect 
females have inside buds, which, when born, are not miniatures of 
their mother, but resemble the parents which laid the eggs the year 
8 
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COCHINEAL INSECT.  (Coccis cacti.) 
before. These grow rapidly, and soon fly, and lay eggs in their 
turn. It is very evident that simple arithmetic can show that one 
plant louse might produce a quintillion during one year. It is 
easy then to understand the occurrence of enormous multitudes 
