Ward. — Some Thames Bacteria. 
309 
diameter, and are arranged in irregular botryoidal clumps. 
It grows best at ordinary temperatures, and poorly at 30- 
33 0 C. The growths on Agar and Potato are strikingly similar 
to my results, but there are minute differences in the 
description of the plate-colonies, possibly due to differences 
in the temperature of our cultivations. Lustig 1 describes 
a red form ( Coccus ruber) which Maschek found in water, 
and which he regards as probably identical with Zimmer- 
mann’s species. The differences in the two descriptions are 
nearly, if not quite, as great as those between Zimmermann’s 
account and mine, only Lustig gives too few particulars 
(e.g. as to temperatures, &c.) for a decisive judgement. 
Another red Micrococcus is Flugge’s M. cinnabareus 2 , also 
found in water and air. Excepting that the cocci are described 
as ‘ large/ and frequently in pairs or in tetrads, and that the 
plate-colonies are red-brown under the low power, there is 
nothing in the short diagnosis to separate this form from 
the above, and we may well suspect that they are one and 
the same form, for the naked-eye colours of Flugge’s species 
agree very well. Of course much depends on what 4 large ’ 
means in his diagnosis 3 . 
Mace 4 describes under the name M. roseus (Flugge) 
a common air-form, in twos, threes or tetrads, with flat 
faces, about i*4ju along the greatest diameter. It does 
not liquefy, but the description is too meagre to make much 
of. Mace also points out how similar these forms appear 
to be, and remarks that the form termed M. cinnabarinus 
of Zimmermann cannot be distinguished from Flugge’s 
M. cinnabareus. 
This M . roseus of Flugge must however be distinguished 
from the M. roseus of Eisenberg referred to below, as well 
as from the M. roseus described by Maggiora 5 , a non- 
1 Diagnostik der Bakterien des Wassers, p. 40. 
2 Flugge, Die Mikroorganismen, 1886, p. 174. 
3 Mace, Traite pratique de Bacteriologie, p. 335, gives 0.9 /x, which would 
strengthen the force of the above. 4 Mace, p. 334. 
5 Giorn. d. Soc. ital. d’igiene, Anno XI, 1889, p. 356, No. XXII. 
Y 
