222 Ward. — Thames Bacteria , III. 
Plates. Grey, granular, dense and structureless colonies, just visible 
in forty hours. Slow and non-liquefying — at least at first, but (see 
streak) they slowly liquefy later. 
Streak. Grey-white, spreading, and eventually scoops and sinks, 
slowly liquefying — white. 
Stab. White points in tunnel. In fourteen days a thistle-head 
and yellowish-white precipitate, and dots in tunnel. In a month 
half-liquefied, turbid, copious white deposit. Grows also in acid 
gelatine. In a year a brownish-yellow liquid, clear, and very glairy 
deposit, pale brown. 
Agar. White along the streak, or greyish, often hardly visible in 
three weeks. Growth visible in fifteen hours, and forms a white 
mesentery in two days : waxy and very white in four ; but even in 
fourteen hardly spreads beyond the streak. In a month it is little 
spread. White flocks in drainage. 
Potato. Nothing in four days : in seven a very thin wet white film. 
In three days at 20° are formed white flecks, wet, and exactly the colour 
of the potato. In seven days a thin dew-like, colourless wet film. 
Broth. Soon clouds, and deposits a white precipitate. Very turbid 
in eighteen hours and same to third day. On fifth day not very turbid, 
slight deposit, no veil. In a month no veil, turbid throughout, and 
yellow-white deposit. 
At 20 0 C., distinctly turbid in forty-four hours, and in four days 
turbid but no veil : white deposit. Similar in seven days, and on the 
eleventh day there is still no veil, only yellowish-white flocculent 
deposit, &c., as before. 
Milk. No visible change in seven days. Acid reaction. 
Glucose. No change in a week. 
Perhaps fi and </> are connected, but they are slower in broth. 
Agar suggests the union of <£, £ and t, and broth connects £, and 
6 more or less. 
I am inclined to regard £ as a form of Proteus ; while the potato- 
cultures strongly support this, the microscopic characters do not help 
us. On the whole it is probably a weakened form. 
Variety p., Fig. 34. 
Habitat. The Thames. 
Morph. Extremely short and small rods : nearly cocci : no motion : 
1 to i*5 x 0.75 fx. 
