Microscopical Essays. 



clutter but few of thefe bulbs compared with the number of the 

 vorticellas, neither do all the bulbs come out at the fame time. 

 The bulb then divides lengthways into two fmaller ones, but 

 which are {till much larger than the vorticelhe themfelves. It is 

 not long before thefe are feparated like the firft, and thus form 

 four bulbs on the fame ftalk ; thefe again divide themfelves, and 

 form eight, which again fubdivide, and confequently make fix- 

 teen. Thev are all connected with the ftalk by a proper pedicle, 

 but they are not all of an equal fize ; the largeft continue to 

 divide, and the fmalleft begin to open, and take the bell-formed 

 fhape. Mr. Trembley obferved from one round bulb, in about 

 twenty-four hours, by repeated divifions, one hundred and ten 

 vorticellse to be formed. 



It has been afked with propriety, what plant, or what animal, 

 could have led us to expect an exigence and mode of propaga- 

 tion fimilar to that of the vorticella anaftatica ? 



Fig. 13 reprefents one branch of the vorticella anaftatica ; on 

 this branch, befides the vorticellse which are of a bell-like form* 

 fome of thofe round bodies from which they firft fpring, and by 

 which they are fo remarkably diftinguifhed from many other fpe- 

 cies, may be feen. 



Fig. 14 reprefents one of the globular bodies, after it has parted 

 from the clufter, and has fixed itfelf to fome other body, and after 

 . the globule itfelf and it's pedicle have begun to lengthen. 



Fig. 15 reprefents the two bodies that were formed by the part- 

 ing of that which is reprefented in Fig. 14* 



