C 845 ) 
than fuch a feed, there may be feen 273©ooo» 
4,5 2025 91 
4,5 45 30000 
225 10125 2730000 
180 8100 
— ' p ^ 
2025 9r»i25 
Otherwife I compare the quantity of the Water to the bigncfs 
of a grain of Sand ; in which quantity of water I doubt not 
at all but that I fee more than a 1 00© little Animals, Now, if 
the axuoi a grain of Sand be i, the axis of a drop of water 
isat leaft io,and confequently adrop is a 1000 times bigger 
than that fand, and therefore 1000000 living Creatures in one 
drop of water» In which computation I rather leflen than 
heighten the number. Tis true, my calculus is not , nor can be, 
fo exaS, as precifely to determine the number : But I proceed, 
as thofe do , who intending to number a flock of Sheep 
runniug confufedly one among another, make an eftimate by 
the breadth of the front, and the length of the (ides of a flock, 
how great the number of the Sheep may be. And as he,that feeth 
a thoufand Sheep running together , may in his conjeflure erre 
from the truth a matter of an hundred, more or lefs ; the fame 
may eafily be granted tome ; yet I need not yield, that I ever 
do exaggerate my numbers ; becaufe that the fmalleft little 
Animals, which daily occur to me in water, are more thao 
25 times lefs than a global of blood, becaufe if the axis of 
fuch a little Animal is one, that of a globul of blood isat lead 
three; now 3 
3 
9 
3 
27.. 
Thefe, Sir, I thought good toadd to the Obfervacions , I 
have made, and fliew'd toothers, with the applaufe of the 
beholders. The reft, and the makeof the Microfcopes , em- 
ployed by me, I cannot yet communicate. After I had fenc 
away my former Letter, I gave not over obferving the ammaU 
mU in water j examining alfo diftilled and boiled Waters^ 
