300 THE INDIAN JOURNAL OF VETERINARY SCIENCE AND ANIMAL HUSBANDRY [ I, IV

the fibrous capsule intact, these appear to be of an oily dark-bluish colour which
is quite distinct from the greyish-green colour brought about by decomposition
changes and resembles to a certain extent the colour of the distended cardiac veins.
On removal of the easily detachable fibrous capsule, the surface presents a dark-
violet colour, and an examination of a section of the organ shows that the
blue colour is not present in the parenchyma, but that the cortex shows only
intense congestion. Particles of dark-yellowish pigment have been found in the
leucocytes on histological examination of this kidney lesion. In over three hundred
cases of post-mortem examination conducted on animals dead of piroplasmosis at
Muktesar, this kidney lesion was constantly found to be present. Cases have been
met with where no other lesions were encountered, excepting this colour lesion
of the kidneys, and microscopical examination in such cases has always confirmed
the diagnosis of clinical piroplasmosis. It is believed, therefore, that this hitherto
undescribed lesion forms an easy and reliable method of post-mortem diagnosis in
" redwater " of Indian cattle.