Ward. — Thames Bacteria , III. 
209 
and they will give better ideas of their character than a lengthy 
description in words would do. In Fig. 17 two of the pseudo- 
podia, as I shall term them for the sake of brevity, were 
sketched in outline (a) and their changes recorded for each 
succeeding, minute ( b to e). First, the lower thin tongue 
curved up towards and fused with the flame-like pseudo- 
podium above ; then it broke away from its basal connexion 
with the corona (to the right below), thickened up, and 
gradually fused laterally with the small blunt lobe near 
the x — a nearly fixed point throughout, and so converted 
the bay in which the x lies into a closed space ; the changes 
during the next two consecutive minutes are seen in d and e. 
Even more astounding are the changes seen in Fig. 18, 
where the changes of outlines (< a to n) were drawn at intervals 
of half to one minute — practically as fast as I could record 
them, in fact. 
The curved outline in which a is placed was the peripheral 
end of a blunt lobe of the coronal film, and just outside to 
its left was a serpentine free mass of the Bacteria. This 
latter was writhing like a worm, and in less than a minute 
broke in two ( b), its distal part continuing to writhe freely, 
while the proximal one first joined the blunt lobe and then 
stretched out and again joined the free part (c). Again it 
broke and a free shorter part wriggled off ( d-J ), and this 
alternate breaking off (two pieces in g) and joining up again 
went on for a minute or two ( d-h ). At last the free curved 
end of the worm-like part curled over and made a loop (i, k ), 
and it remained a constituent part of the larger pseudo- 
podium, its further changes being sufficiently evident from 
m and n. 
The series in Fig. 19 shows the somewhat slower changes 
observed in one of the broad and blunt lobes of the coronal 
film, the most marked alterations being observable in the 
outlines of the enclosed area in which the x is placed, b 
was drawn four minutes after a, c a minute after b , and 
d a minute later. 
One of the most interesting cases is shown in the series 
