Ward.- — Thames Bacteria , III . 
239 
yellow, wet, flowing mass runs over the potato, and in a week 
the general tone is more and more golden-yellow, displacing 
the ochre and the pink. All wet and gummy-looking. 
Broth at 25 0 C. Slightly turbid in twenty-four hours. 
In a week a faint white ring, slight turbidity, and abundant 
yellowish-white deposit. In nine days a dense white free 
veil, no ring and the liquid turbid. Resembles No. 23. 
In old cultures the liquor is sherry-colour and the deposit 
pale ochre. 
Milk at 25 0 C. No visible alteration in three weeks, but 
the liquid is acid. In a month the casein is partially separated. 
Glucose at 25 0 C. No result. 
Dr. Kanthack found it was not pathogenic for guinea- 
pigs. I found it impossible to revive No. 31 from agar- 
tubes a year old. 
On comparing No. 31 with No. 23, the following are the 
only differences to be noted. 
The sieve-like film on the surface of stab-cultures — not 
essentially different in type from the stellate film of No. 23 
The very slow streak-cultures at both 1 5 0 and 23 0 C. 
The pink hue on potato-cultures is a difference, though 
it did not persist. Here again we cannot insist on the 
differences, though they appear in parallel cultures, and 
I therefore place No. 31, with Nos. 23 and 7, as mere varieties 
of the same form — B. radiatus (Zimm.) and belonging to 
the Proteus group. 
No. 17: B. ochraceus (Zimm.). Figs. 49-53. 
Morphology &c. Composed of very short rods 1x0-5// 
in rows as stained. Fresh preparations show pairs of rodlets 
2 x o-6 to 0-7 /u, or long series, i. e. filaments, segmented into 
rods about 1 x o*6 /ot. Old gelatine-cultures give cocci about 
o-6 x 0*5 to rods 2-1 x o-6 /u,, all quiescent : old agar-cultures 
give all cocci or very short rodlets about 1 x 0-7 /u. 
On plates at 12-1 5 0 very small yellow colonies, which in 
three to four days float in a viscous liquid, as circular, yellow, 
