194 
The result of my observations so far appears to be that in 
addition to the wave of light already seen, the separate 
objects causing that wave may now be observed in the 
manner I describe; what these objects are is still a matter 
to be determined, but at present I am inclined to believe 
them to be cilia on the cell wall, while at the same time 
there are also independent moving corpuscles within the 
cell; some of these bodies have the appearance of crystals, 
and in one specimen I observed a great number of starch 
granules in the cells. 
In investigating this subject the smallest step in advance 
cannot but be deemed of importance, and I trust that in 
giving the results of my observations as they occur, I may 
be the means of saving time and trouble to others who may 
be investigating the same class of objects and of inducing 
them to follow up so interesting a subject, as it is only by 
many and independent observations the truth can be ascer- 
tained. 
For the information of members I may state in detail the 
method of observation I have found most successful. 
The microscope I made use of is one of Smith and Beck’s 
largest sized binocular, with one of Beck’s most recent ith- 
inch objectives. 
The illumination was by means of an Argand gas burner, 
the light passing into a right-angled prism below the stage 
in a line with the axis of the object glass. 
Immediately beneath the stage was the achromatic con- 
denser, used both with and without the central stop in the 
diaphragm, the object being seen equally well in both ways 
with different effects of light. 
Below the achromatic condenser was fixed Darker’s series 
of selenites, and below this the polarizing prism, the analy- 
sing prism being inserted immediately above the objective. 
I made use of the low Huyghenian eye-pieces, and used 
the microscope either as a binocular or single tube, the field 
being well illuminated in each case. 
