Ward . — Thames Bacteria , III. 205 
In some cases the growth at 34 0 is exactly like form 24 
side by side, but the margins are a little thinner. 
Potato. No visible growth, though possibly a transparent 
thin layer exists. 
Broth at 35 0 . Shimmering turbid in twenty-four hours, and 
in forty-eight hours a slight deposit falls. In a week it is 
still slightly turbid, with flocculent, floating, serpentine masses, 
and traces of deposit. In a fortnight the liquid is clear and 
yellow, the flocculent deposit yellowish-white, and consists 
of rods 10—12 /x and longer, and about 1 p thick. At 25 0 the 
progress is very similar. The turbidity increases in forty- 
eight hours, flocks and deposit as before. In a week it is 
still shimmering : in a month the liquid is clear, and an 
abundant yellowish-white deposit has formed. 
Milk at 25 0 . No change in fifteen days, but in a month 
nearly all is peptonized and the turbid buff liquor is strongly 
alkaline. 
Glucose solution at 25° gave no results. 
Pathogenicity. According to Dr. Kanthack \ a guinea- 
pig, after intra-peritoneal injection, suffered no effects what- 
ever. 
No. 51 : Type of Proteus vulgaris. 
Much less common than No. 50, though among the common 
types in the Thames ; is a powerfully liquefying, non-pigmented 
form with the following characters. 
It occurs on the plates as short rodlets about 3 x 0*75 /x or 
a little thicker, and is motile. In broth the rods are chiefly 
3 x o-8 or 4 x o*8 /x or a little thinner, but filaments up to 30 
or even 40 \i long occur, and have a serpentine motion. 
The shorter rods are often paired. The movement con- 
sists in a waggling about the centre of the rod, as well as 
forward motion, but not the rapid darting movements of 
No. 5 °- 
1 My late colleague, Dr. Kanthack, Professor of Pathology in the University of 
Cambridge, kindly examined many of these forms for me as regards their pathogenic 
properties. 
P 
