122 CE C O N O M Y 



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 putrefaftion of carcafes, but 

 at the fame time by the oeconomy of nature 

 the neceffaries of life are provided for many 

 animals. In the like manner many infers at 

 once promote their own good, and that of 

 ether animals. Thus knats lay their eggs in 

 flagnant, putrid and {linking waters, and the 

 grubs that arife from thefe eggs clear away 

 all the putrefaction ; 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 will foon find the 

 water, that is full of grubs^ pure and without 

 any flench, while the water that has no gruhs 

 will continue {linking. 



Lice increafe in a wonderfull manner in thq 

 heads of children, that are fcabby, nor are they 

 without their ufe, for they confume the redun- 

 dant humours. 



The beetle kind in fummer extrafl all moifl 

 end glutinous matter out of the dung of cattle, 



