Animalcules  in  Waters.
9k
of  theſe  was  ſhaped  like  Bells,  with  long
Tails,  whereby  they  faſtened  themselves  to
the  Roots  of  these  Weeds;  and  sometimes
twenty  of  these  were  seen  together,  gently
extending  their  long  Tails  and  Bodies,  and
then,  in  an  Instant,  contracting  them  again.
See  the  Draught,  Plate  VIII.  Fig.  I.
A,  represents  a  Root  of  Duck-Weed  with
the  Tails  of  many  Animalcules  adhering  to  it.
bbbb,  Sc.  ſhew  their  Bell-like  Bodies.
cccc,  their  long  Tails.
Another  extraordinary  Kind  of  Animalcule
(which  see  Fig.  II.)  appears  in  à  Sheath  or
Case  a,  b,  c,  the  End  whereof  it  fastens  to
the  Duck-Weed  Roots.  This  little  Creature
has  two  seeming  Wheels  with  a  great  many
Teeth  or  Notches,  coming  from  its  Head,
and  turning  round  as  it  were  upon  an  Axis,
d,  e.  At  the  leaſt  Touch  it  draws  the  Wheelwork -
  into  its  Body,  and  its  Body  into  the
Sheath,  after  which  it  appears  as  Fig.  III.
But  when  all  is  quiet,  it  thrusts  itself  out
again,  and  the  Rotation  of  the  Wheel-work
is  renew'd.  Mr.  LEEUWENHoeK  took  notice ¬
  of  one  of  theſe,  whoſe  Caſe  ſeem'd  composed ¬
  of  minute  Globules  (Fig.  IV.  a,  b.
and  in  this  he  discover'd  the  Wheel-work  to
consist  of  four  roundish  Parts  with  little  Divisions ¬
  between  each,  though  only  three  of
those  roundish  Parts  could  be  seen,  the  fourth
lying  behind,  as  represented  Fig.  V.  This
convinced  him  how  much  he  had  been  mistaken, ¬