LETTER 18. PEPPER-WATER 1438 
long, and bent crooked, the upper part of the body round, 
but flat beneath, looking much after the fashion of an 
s part of the peel of a large citron. Their motion was all 
a-wallowing, on their back as well as on their belly. I 
could discern no little feet or legs on them; and after this 
time, moreover, I never saw them any more. In the 
evening, about 10 o’clock, I saw the very little animal- 
cules, and the round ones,” in much greater numbers; 
together with a little animal that was 3 or 4 times as 
long as broad *; and besides these, many little worms, or 
little eels *, which were even smaller than the very tiny 
eels spoken of before. 
On the 6th ditto, about 6 o’clock in the morning, [ 
discovered a very great many (indeed, incredibly many) 
exceeding little animalcules, to which, because of their 
littleness, no shape can be given’; and with these a very 
great number of round animalcules,’ which to my eye 
seemed quite eight times as big as the first animalcules (in 
which I have just said I could make out no shape). These 
round animalcules I imagine to be more than 50 times 
smaller than the eye of a louse. And besides these there 
was a third sort,’ that were twice as long as broad, and 
which had about the length of the round animalcules. 
The fourth sort * was the very tiny eels; but now I could 
not see their bending, when they moved, so very plainly 
as I had seen it before: and at this time too I saw some 
(though very few) animalcules, which had very nearly the 
length of the eye of a louse, and which were in shape very 
" Bacteria. 
° 9? Monas sp. 
* Unidentifiable; ? a small flagellate. (Had it been large, L. would 
doubtless have supplied some further details.) 
* Bacteria, probably Spzrzllwm sp. 
> Bacteria. 
° Larger bacteria ? (“8 times as big” = of twice the diameter.) 
* Unidentifiable. 
* Spirilla. 
