zsQ Microscopical Essays. 



they form themfelves into a kind of rope, which (lowly defcenck 

 as low as they intend. 



A fmalt quantity of the matter containing thefe creatures having 

 been put into a jar of water, it fo happened, that one part went 

 down immediately to the bottom, whilft the other continued float- 

 ing on the top. After fome time, each of thefe fwarms of animal- 

 cula began to grow weary of it's fit nation, and had a, mind to 

 change it's quarters. Both armies, therefore, fet out at the fame 

 time, the one proceeding upwards, and the other downwards ; fo 

 that after fome hours journey they met in the middle. A defire 

 of knowing how they would behave on this occafion engaged the 

 obferver to watcli them carefully, and to his furprize he faw the 

 army that was marching upwards open to the right and left, to- 

 make room for thofe that were defcending. Thus without con- 

 fuuon or intermixture, each held on it's way, the army that was, 

 going up marching in two columns to the top, and the other pro- 

 ceedinginone column to the bottom, as if each had been under - 

 the direction. of wife leaders.. 



63. Vibrio Lunula. 



Vibrio arcuatus, utraque extremitate aequali, Eig, 16. Bbw-- 

 fliaped vibrio, both ends of an equal hze. 



The body refembles much the ih ape of the moon at the fkhV 

 quarter; it is of a green colour, and has generally from feven to 

 ten globules difpofed lengthways ; the fmaller ones are of a very 

 pale colour, a pale green vacuity may fometimes be feen in the 

 middle: fome little varieties may be obferved amongft them 5s 



which:- 



