220 
Ward . — Thames Bacteria , ///. 
turbid. On the seventh day a thin veil, which breaks to flecks on 
shaking. In a month turbid above, and a slight ring and veil and 
yellow-white precipitate. It shows alliances with several other forms, 
and may be a weakened form of No. 9. 
l ( Variety of Proteus type), Figs. 27 and 28. 
Habitat . The Thames. 
Morph. Extremely small and active rods 2-3 x 0-75 to 0-5 1 u. 
Plate. Yellow-grey, slightly sunk, zoned and radiate circles, just 
visible as points under the ^ in forty hours, visible to the unaided eye 
in ninety hours. Gelatine completely liquefied in 115 hours. 
Streak. Slowly scoops and liquefies the gelatine with a white 
deposit. 
Stab. Very slow growth as white, leafy, frondose colonies, and dots 
in upper part only. In a month it has liquefied | of gelatine, and 
forms a white deposit on the flat base : liquid perfectly clear. 
Agar. Merest film or nothing visible on the fifth day, and hardly 
visible in three weeks. After being some time in culture, a rapid 
white streak extending in fifteen hours ; a milk-white broad streak in 
two days ; spreading, yellow-white, and thicker in four days. Thin, 
yellowish, and extended in fourteen days. In a month a thin white 
layer not spread much. Recalls forms $ and {. 
Potato. Yellow-buff wet film, not unlike form it but more waxy. 
At 20 0 nothing appears, or a mere wet film in three to seven days, and 
even in eleven days a mere trace is seen as a faint white film. 
Broth. At 35 0 no trace in a month, and another attempt gave 
nothing in a week. At 2 5°the broth becomes turbid and has a whitish 
deposit. 
Milk. Precipitates casein in five days. Alkaline reaction. Solution 
later; nearly all gone in three weeks, liquor yellow. All clear in 
a month. 
Glucose. No results. 
Several points (e. g. its behaviour on potato) suggest its resemblance 
to 7r, which may be a stronger form. 
Agar suggests resemblances to forms <£ and £, and the negative 
results on broth suggest and y. 
On the whole, colony t seems to be one of the Proteus group, 
probably a very weak form. 
