300 
Ward . — Some Thames Bacteria. 
But these are not the only micrococci described as having 
these ‘ capsular * investments, as the following list shows 
Micrococcus of Bovine pneumonia, Poels and Nolen, from the 
lungs of cattle infected with pleuro-pneumonia, and 
resembling Friedlander’s bacillus in many respects. 
Diplococcus of Horse pneumonia (Schiitz), a similar but im- 
perfectly described form. 
Haematococcus Boris (Babes) ; Pseudodiplococcus pneumoniae 
(Bonome), indistinguishable from M. pneumoniae 
crouposae except in its growth at lower temperatures ; 
M. ureae (Pasteur) ; M. luteus (Cohn.) ; M. viticulosus 
(Katz), are other species described as capsuled or 
forming investing zoogloea masses. 
I am unable to refer my Thames form to any of the fore- 
going with certainty, and am inclined to suggest that it 
should receive a name as a new ‘ species.’ 
From a Petri-dish, in which a plate-culture had been 
made from a drop of water impregnated by shaking up 
a zoogloea-mass grown on Agar, I removed a little of the 
gelatine-film with a loop, and transferred it to a culture- 
cell, suspending it from the cover- slip as for a hanging-drop 
culture. 
The plate-culture had been going twenty-four hours at 20°, 
and the colonies were just visible — hardly so without a lens— 
and my idea was to watch the behaviour of a rodlet at the 
thin margin of a colony. 
To do this, however, it was necessary to raise the tem- 
perature of the culture chamber just sufficiently to soften the 
gelatine and make it spread a little, for no matter how 
carefully one prepares such a culture as the above, the play 
of lights reflected and refracted at the conchoidal fractures 
of the solid splinter of gelatine interferes seriously with 
observations under high powers. 
Consequently it was necessary to warm the whole to 
nearly 25 0 C., and then let the minute-drop solidify again. 
