Ward . — Thames Bacteria , III. 233 
of rods, each about 3-4 \ m long by 0-5 or o*6 /x thick, in series. 
Each rod 4 /x long seemed to consist of four segments, so that 
we may take the unit-rodlet as about 1 X 0*5-0 * 6 /u. Old 
gelatine-cultures give cocci. 
Plate-cidtures at 12-15° yielded variable colonies of the 
mycelioid and branched zoogloea- and arborescent forms 
(Figs. 43 and 44) so common in B. arborescens and its allies, 
and comparable with those of No. 23. After being in culture 
some months, plates at 18-21° C. showed the tenuous bluish, 
hardly visible, circular clouds (like No. 23) in forty-eight hours, 
and these on the third day are about 5 mm. diameter. On 
the fourth day 8-10 mm., very tenuous and cloudy, and with 
offsets like nebulae around (Fig. 43 a). 
Under the -3 any group of these offsets is seen to be com- 
posed of extremely fine, curved, reticulated and branching 
colourless tresses, radiating from serpentine, yellowish, central, 
stouter, curved and branched zoogloea-tresses (Fig. 43 b). On 
the fifth day the colonies are 15-20 mm. in diameter, very 
grey and cloudy, and spreading into the gelatine, which 
softens. On the sixth day the ochre-yellow colony opens 
into sieve-like mottled nets, with thin contoured iridescent 
margins (like No. 23). 
After passage through broth, the cultures at 20° (see Figs.) 
go through the serpentine zoogloea stage, to dendritic and 
mycelium-like forms, exactly as in B. arborescens , and in six 
days liquefy and become more and more ochre-yellow. These 
colonies fall to pieces and float before the sieve-like stage is 
reached. 
Stab-cidtures at 12-15° showed in two or three days as 
a yellowish or ochre film, spreading like a spider’s web, or 
like irregular stars over the surface, while ochre dots appeared 
in the tunnel (Fig. 45). The gelatine liquefies, and in a week 
the yellow film has sunk, one-tenth of the gelatine being 
liquefied and somewhat turbid, and an ochre-yellow precipitate 
lying on the flat floor. Growth is very slow in the tunnel, 
cloudy masses occupying its narrow calibre. In two months 
half the tube is liquefied, and a bright orange deposit lies on 
