Ward . — Thames Bacteria , III. 229 
gelatine is suggestive. Plates kept at 15-18 0 C., for forty hours, 
showed the characteristic clouds consisting of the fimbriated 
mycelia with snake-like zoogloea-tresses as centres. On 
putting the plate under the Zeiss C, in Sachs’ box at 20° C., 
the characteristic swarming islets described above (p. 209) 
were seen on the surface and their movements traced, an 
example being given in Fig. 40, where the changes are 
recorded at intervals of one minute. These islets, which are 
composed of the slender rods or coiled filaments, closely 
arranged side by side, are seen to change shape, advance and 
retreat, form new connexions or break away from old ones, 
in a manner so suggestive of the movements of an Amoeba 
that one might almost take them for something of the kind. 
They are exactly as Hauser describes them. The whole 
plate is liquid in five to six days. One point of difference 
between Hauser’s Proteus and this one is that the movements 
do occur on the moist surface of 10 per cent, gelatine, though 
very much more slowly than on 5 per cent, gelatine. 
Stab-cultures at 12-15° C. begin with the development of 
yellow dots in the tunnel and a film above. 
In five days the latter is sinking, and is a circular yellow 
colony, spreading like a yellow star from a central eye ; the 
dots in the tunnel are larger. The colour is brighter, more 
decidedly yellow than No. 7, but they are much alike. In 
three weeks about one-tenth of the gelatine is liquid, turbid, and 
with yellow floating flocks, and a yellow deposit on the flat 
floor : the tunnel is somewhat wider. In two months half the 
gelatine is liquefied, and an ochre deposit lies on the flat 
floor below the turbid liquor. Almost the only distinction 
between this and No. 7, is the floating yellowish flocks, 
forming an imperfect veil. 
At 1 8-21° a bluish-white circular film and cloudiness all 
round the axis in forty-eight hours, and sinking just beginning 
at the yellow eye (Fig. 41). In three days the faint cloudi- 
ness pervades the upper part of the gelatine, and a cloudy 
yellowish film above covers all ; liquefaction supervenes by 
the fifth day, no cloudiness is left, and the clear liquid in 
