126 
LEEUWENHOEK AND HIS ‘‘ LITTLE ANIMALS ”’ 
The 11th ditto, observing this water again, I saw the 
foresaid small animalcules, though very few in number. 
The 12th ditto, I saw the very small animalcules, as 
yesterday ; and besides these, a little animal’ that had 
nearly the figure of a mussel-shell, lying with its hollow 
side downwards. “T'was of a length anigh that of a 
louse’s eye.” 
The 13th ditto, in the morning, I found the said very 
small animalcules in greater number, and I saw also one 
bigger animalcule, like that just spoken of.” The same 
day, in the evening, I perceived the said very small 
animalcules again in no less number; and I could now 
see that they had a clear or transparent projection at the 
hind end of their body.* Moreover I discovered animal- 
cules which were somewhat longer than an oval.’ These 
were about 6 times as long as the foresaid very small 
animalcules ; and their head, which was somewhat long 
drawn out, they oft-times pulled in, and then looked to 
be almost round. ‘There were also animalcules’ which 
appeared perfectly round, their diameter being twice as 
long as that of the smallest animalcules of all. These 
two large sorts were very yielding, so that their body did 
bend before the least little filament which they chanced 
to brush against in the water. 
The 14th ditto, I perceived the oval animalcules in 
greater number.’ 
' Traditionally—and doubtless with justice—identifiable as Stylonychia 
mytilus (O.F.M.) Ehrbg., a common hypotrichous ciliate. 
* That is, about 70m. See p. 336. 
*ie., Stylonychia. 
* Probably Monas again—or perhaps a Cercomonas. 
® From the description which follows it seems probable that these were 
Dileptus sp., but it is impossible to identify them with certainty. 
© Perhaps Cyclidiwm again — similarly described on June 13 (4th 
observation). 
7This apparently refers to the oval animalcules seen on the 10th 
(2 Cyclidiwm). 
