PARASITES DURING THEIR WHOLE LIFE. 



263 



these beings as riders on both the vegetable and animal 

 kingdoms to restrain them with a bridle. What the 



gardener does to plants, the aphis has often done before 

 in order to arrest a too vigorous and rapid growth. 



The cochineal insect (Coccus cacti) Figs. 80 and 81, 



13 



