92 Animalcules in Waters, 
taken, in believing them, from their cortf~ 
mon Appearances, to be two Wheels, 
whereas the real Form of this Wheel-work 
is as at Fig, V. 
To find thefe Animalcules , ehoofe Duck- 
Weed that has long Roots; for young Plants 
with ftiort Roots feldom afford any. Be 
careful too that they are not covered with a 
rough Matter, or tending to Decay, as they 
will often be. Let the Roots fink gently 
down in a Glafs Tube filled with Water, 
and fo apply them to the Microfcope. Two 
or three Animalcules will be found fometimes 
adhering to one Root; and at other times 
you may examine feveral, and not be able to 
meet with any. 
In the Water, or flimy Matter, found in 
Leaden Pipes or Gutters, Mr. Leeuwen¬ 
hoek met with various Kinds oi Animal¬ 
cules ^ and, among the reft, with Multitudes 
that appeared to have a Sort of Wheel-work, 
turning round fomewhat in the former Man¬ 
ner Thefe Creatures, when the Water 
dries away, contract their Bodies into a glo¬ 
bular or oval Figure, and reddilh Colour, and 
become fixt in the dry Dirt, which grows 
as hard as Clay : but whenever a Piece of 
fuch Dirt is put in Water, in about half an 
Hour’s Time they open, and by Degrees ex- 
* Phil, Trnnfaft. Numb. 289. Lee v wen. Arcan. Nat . 
Tom. II. Epift. 149. 
tend 
