MlCROSC O PIC AL 



Essays. 



the body, the edges often yellow ; a fmall obtufe incifion may be 

 difcovered on the edge, which is, perhaps, the mouth of the 

 animalculum. This little creature appears to be encompaifed 

 with a kind of halo, or circle. If this is occafioned by the vibra- 

 tory motion of any fringe of hairs, they are inviflble to the eye, 

 even when aflifted by the microfcope. 



It feems to have a kind of rotatory motion 5 at one time flow, 

 at another quick, and is to be found in water where the lemna 

 minor grows, fometimes as late as the month of December, 



17. Volvox Grandinella. 



Volvox fpha^ricus, opacus, interaneis immobilibus. Spherical 

 and opake, with immoveable interlines. 



This is much fmaller than the preceding, and is marked with 

 feveral circular lines ; no motion is to be perceived among the in- 

 terior molecules. It fometimes moves about in a (trait line, fome- 

 times it's courfe is irregular, at others it keeps in the fame fpojt ? 

 with a tremulous motion. 



i8. Volvox Socialis. 



Volvox fphasricus, rnoleculis cryftallinis, acqualibus diflantibus. 

 Spherical volvox, with cryftalline molecules, placed at equal 

 diilances from one another. 



When 



