202 
LIFE, IH ITS INTERMEDIATE FORMS. 
leaves of Myriophyllum are pretty sure to be more or less 
studded with, the erect tubes, which are quite visible to the 
naked eye. 
Ou being brought under the microscope with a power 
of 100 or 150 diameters, you can see a tall chimney of 
a yellowish-brown hue, standing on a leaf, slightly widen- 
ing from tho bottom upwards, and terminating in an irre- 
gular edge. Presently, a pellucid body peeps from the 
summit, like a sweep out of the chimney-top (pardon the 
similitude), and, rishig higher and higher, suddenly unfurls 
a disk of four expansive petals, not altogether unlike those 
of a Heart’ s-ease, but made of crystalline material, and set 
round the margins with a row of those beauteous cilia, 
whose dark waves chase each other in ceaseless play, up 
and down, round and round, in the most charming manner. 
Behind the disk, which by a bend of the upper part of 
the body is brought to assume a vertical position, there is 
a little hemispherical cavity on the surface, which is lined 
with cilia, and this is connected by a series of cilia with 
the sinus of the two great upper petals of the disk. 
The ciliary wave, after making the circuit of the disk, 
passes off behind in a great current through the sinus 
just alluded to, carrying with it all the floating particles 
that are not fit for food, or that have not been carried into 
the mouth. These particles are hurled along until they 
reach the little hemispherical cavity, in w’hich they are 
caught and whirled round and round with great rapidity. 
Hero, too, they are probably mixed with some glutinous 
secretion, and the effect of the gyration is the consolida- 
tion of the particles into a little globular pellet. No sooner 
is this ready, than the animal quickly bends forward its 
