£0©;. Microscopical Essays*. 



£5, Vibrio Undula* 



Vibrio Eliformis flexuofus. A filiform flexuous vibrioi. 



A perfect undulating little line, round, gelatinous, without any 

 vifible interlines. It is never (trait ; when at reft it refembles the 

 letter V, when, in motion the letter M, or a bending line like that 

 which geefe form in their flight through the air ; it's motions are 

 fo rapid, that the eye can fcarce follow them. It generally refts- 

 upon the top of the water, fometimes it fixes itfelf obliquely by 

 one extremity, and whirls itfelf round. 



This is the little creature that Leeuwenhccck fays exceeds im 

 flendernefs the tail of the animal culum feminale, which he has- 

 defcribed in Fig. 5, Epif. Phyf. 41, being an hundred times lefs- 

 than a muftard-feed, and on which he makes the following very ju0 

 ©bfervation : That as thefe very fmall animalcula can contract 

 and varioufly fold their little tails, we muft conclude that tendons 

 and mufcles are as neceffary to them as to other animals ; if to- 

 this we add the organs of fenfation, and thofe of the inteftines,. 

 the mind is loft in the aftonifhment which arifes from the im- 

 preffion of infinite, in the indefinitely fmall. 



56. Vibrio Serpens,. 



Vibrio filifbrmis, ambagibus in angulum obtufum pTOducls. A 

 filiform vibrio, the windings or flexures obtufe. 



A flen- 



