m (ECONOMY 
reflux foon change the ftate of the fea, they 
themfelves are often detained in pits, and be- 
come a prey to the wild beafts, that frequent 
the ihores. Thus the earth is not only kept 
clean from the putrefadion of carcafes, but 
at the fame time by the oeconomy of nature 
the neceflaries of life are provided for many 
animals. In the like manner many infefts at 
once promote their own good, and that of 
other animals. Thus knats lay their eggs in 
ftagnant, putrid and {linking waters, and the 
grubs that arife from thefe eggs clear away 
all the putrefaction j and this will eafily ap- 
pear, if any one will make the experiment by 
filling two vefiels with putrid water, leaving 
the grubs in one, and taking them all out of 
the other. For then he v/ill foon find the 
water, that is full of 4 grubs d pure and without 
any {tench, while the water that has no grubs 
will continue {linking. 
Lice increafe in a wonderful! manner in the 
heads of children, that are fcabby, nor are they 
without their ufe, for they confume the redun- 
dant humours. 
The beetle kind in fummer extrad all moift 
and glutinous matter out of the dung of cattle* 
fo 
