I 
114 (ECONOMY 
manner that the weaker generally are infefted 
by the flronger in a continued feries. Thus 
the tree- loufe lives upon plants. The fly called 
mufca aphidivora lives upon the tree-loufe . 
The l ornet and wafp fly upon the mufca aphi- 
divora, The dragon fly upon the hornet and 
wafp fly . The fpider on the dragon fly . The 
fmall birds on the fpider . And laftly the 
hawk kind on the fmall birds . 
In like manner the n monoculus delights in 
putrid waters, the knat eats the monoculus , 
the frog eats the knat, the pike eats the frog , 
the flea calf eats the pike . 
The bat and goat-fucker make their ex- 
curfions only at night, that they may catch 
the moths which at that time fly about in vaft 
quantities. 
The wood-pecker pulls out the infefts^ which 
lye hid in the trunks of trees. 
The fwallow purfues thofe which fly about 
in the open air. 
The mole purfues the worms . The large 
fifties devour the fmall. Nay we fcarcely know 
an animal, which has not fome enemy to con- 
tend with. 
n An kfe& that has no name in Englifh as far as i can 
find. 
• Among# 
