90 ~ Animalcules in Waters . 
is a delightful Objed for the Microfcope ; its 
white Heart beating dj&ndly, and the Mo¬ 
tion of all its Intedines being perfectly vif- 
bje and extraordinary.—Of the Gnat I fhall 
fpeak farther in its proper Place. 
The Waters every where abound with 
Life, and are an endlefs Subjed of Employ¬ 
ment for the Microfcope ; Seas, Rivers, 
Ponds, Ditches, and almod every Puddle 
can, by its Abidance, prefent us with living 
Wonders never before difcovered : for fuch 
Examinations have as yet been but little at- . 
tended to, even by People that have got 
thefe Indruments, and alfo a Genius to ufe 
them. But I am in hopes this Treatife may 
excite them to be more indudrious, and not 
buffer a little Didiculty, or a few Difappoint- 
ments, to difeourage them from a Study 
that can fo amply reward their Pains. 
In feveral of * Mr. Leeuwenhoek's 
Letters to the Royal Society , we meet with 
an Account of fome furprizing Animalcules 
found adhering to the Roots of the Lens 
Falufns, or Thick-Weed (which in Summer¬ 
time boats plentifully on the Surface of 
Ponds and Ditches), as examined by him in 
a Glafs Tube filed with Water. One Sort 
' . ' C ' ,• • ' 1 '• r - - 
# Vid. Phil . Tran/r Numb. 283, 295, 337. 
of 
