170 Dr. H. Charlton Bastian on the 
order to show the three unequal pigment-masses far away 
from the spore itself, and jammed together in the filament *. 
Many of the spheres have been seen very much further away 
in the filaments than this, and many also have been seen just 
emerging from the spore, as in C, where the middle body is 
much compressed between the other two. 
To casual observation these bodies all appear to be motion- 
less; but after exposure for a little while to the light and 
heat from the microscope-lamp, very faint and more or less 
imperceptible movements can be detected in most of them. 
During my first study of these bodies, while examining a 
spore containing two of them, as in B, I saw one of the 
spheres moving forwards and backwards over a space scarcely 
equalling its own breadth without any visible change in 
shape, and with a slow gliding movement like that of an 
Actinophrys. But through the walls of the spore no rays of 
any kind could be detected then or since, though I have 
repeatedly watched their very slow movements taking place 
when these spheres have been within the spores and also 
within the filaments. Sometimes there has been a distinct 
interval between the forward and the backward movements ; 
at other times it is clear that the movements of the pigment- 
spheres must be more continuous in one direction. 
In October last I had under observation a spore in which 
within and just outside there were four unequal pigment- 
spheres, and also two others some distance away within the 
filament. Thisspecimenisshown in Pl. XIV. fig.3, A ( x 125), 
though the two spheres close together in the filament are 
very indistinct, owing to their being out of focus. After I 
had taken this photograph, with a short exposure, I noticed 
that the movements of the spheres within and near the spore 
were more marked than usual. I left the specimen therefore 
exposed to the light and heat of the lamp (I was using no 
screen at the time) for exactly fifteen minutes, and then I 
took the photograph represented in B (x 250), with an expo- 
sure of three minutes. ‘The results shown are most interesting. 
Dnring the fifteen minutes’ interval the lowest sphere had 
evidently moved considerably, though from the sharpness of 
its outline it is clear that it can scarcely have moved at all 
during the taking of the photograph. The small upper 
sphere had evidently moved less, though very perceptibly, 
during the interval, and had oscillated during the three 
minutes in which the photograph was being taken, as its 
* One of the two smaller bodies is flattened against the upper wall of 
the filament. 
