7 
VORTICELLIDS AND ROTIFERS 279 
its roundness two luttle wheels, which displayed a swift 
rotation, as shown in Fig. 3,a@bc. (The draughtsman, 
seeing the little wheels going round, and always running 
round in the same direction, could never have enough of 
looking at them, exclaiming’ “O that one could ever 
depict so wonderful a motion!”’) These little wheels 
were as Closely beset with teeth, or cogs, as the wheel of 
a watch might be: and when these animalcules had 
thus performed their motions for some time, they pulled 
their little wheels into their body again, and their body 
right into the little case; and soon after they brought a 
part of their body out of the case again, with the motions 
aforesaid ; and at another time they would stay a long 
while inside the case, as though shut up in it. But 
although I had, indeed, formerly discovered such little 
wheels on other animalcules” too, yet their bodies were 
different from these, and their cases were of a dark nature, 
so that you couldn’t easily make out the animalcules in 
them; and therewithal they seemed to be composed of 
pellets. 
And I also saw some cases that were several times 
smaller than that just mentioned, and these * were as 
clear as glass, so that you could see the little creatures 
lying within them quite distinctly. Fig. 3, Pdef, shows 
the case, with the animalcule Pdf, occupying a part of it, 
as it lay taking a rest. Fig. 3, ogh, shows the little case 
1 konde men soo een wonderbare beweginge altijd vertoonen MS. “‘O, 
that he could always see such a wonderful kind of motion’”’ Chamberlayne. 
I take it that the artist’s wish was to be able to portray (vertoonen) this 
motion—not that he might go on looking at it for ever. Regarding the 
artist himself, see p. 343 sq., onfra. 
2 Melicerta ringens. In later letters (MSS. 4 Nov. 1704, to Roy.Soc., 
and 28 June 1713) L. gives an admirable description of this rotifer, and 
describes how it builds its house. See Phil. Trans. (1705), Vol. XXIV, 
p. 1784: also Letter VII (Dutch and Latin works) and Phil. Trans. (1713), 
Voleex VIET; p:.160: 
* Bvidently not rotifers but tubicolous ciliates (Cothurnidae)—probably 
the common Cothwrnia cristallina, though the species cannot be determined 
from the description and figures. 
