i66 



Microscopical Essays. 



the more white and tranfparent day-light ; and befides, either by 

 moving the candle or turning the miorofcope, fuch light may be 

 varied or directed juft as the fubjecl requires. 



It may be alfo proper to take notice, that no kinds of micro- 

 fcopes are fit for thefe obfervations, but fuch as have an open 

 ftage, whereon the flips of glafs, with the liquor upon them, may 

 be placed readily, and in a perfect horizontal pofition ; and 

 moreover, where they can be turned about freely, and without 

 difordering the fluid. 



