No. I.] THE WSMALLE SL! PARLS (OFM SLEW LOR: 243 
the animals have been broken into numerous fragments of 
every possible size and shape. In the field of the microscope 
there are present at the same time naked nodes of the nucleus 
either single or united in groups of two or three, and parts of 
the body, both nucleated and unnucleated, ranging in size 
through every possible gradation from 25m in diameter to 
about 200u. Most of the latter are being driven hither and 
thither by the action of the cilia with which they are covered ; 
and many of them are of the most bizarre and curious 
shapes: T-shaped, Y-shaped, or provided with other arm-like 
processes, or of forms impossible to describe; but most of 
them are of more regular form, triangular, quadrilateral, oval, 
and spherical. 
The moniliform character of the nucleus in these species of 
Stentor insures that a large proportion even of the smallest 
pieces receive at least some part of the nucleus. In order to 
satisfy myself that such is the case, I killed and stained the 
whole of one lot of S. polymorphus, which had been shaken as 
described, about fifteen minutes after the operation. The 
stained material was then mounted in balsam and measure- 
ments were made of the smallest nucleated pieces. Some of 
the measurements were as follows : 
1. Naked nodes of nucleus, spherical or oval; 20-25p. 
2. A spherical piece 31m in diameter containing a single 
node of the nucleus. Nucleus excentric. Protoplasm a thin 
cortex. 
3. A spherical piece 37m in diameter; contained a single 
node of the nucleus. 
4. A spherical piece 37m in diameter; contained two nodes 
of the nucleus. 
5. A spherical piece 40 in diameter; contained six nodes 
of the nucleus. 
6. A spherical piece 50m in diameter; contained one node 
of the nucleus. 
7. Aspherical piece 50u in diameter; contained two nodes 
of the nucleus. 
8. A spherical piece 50m in diameter; contained four nodes 
of the nucleus. 
