ENCEPHALO-MYELITIS IN AN INDIAN CAVALRY REGIMENT             207

extended to a depth of several millimetres below the meninges, separating this
membrane from the ependyma. In one case, a true meningitis with the presence of
an exudate in the meninges was noted. The spinal fluid was in every case clear
and was not increased in quantity, and on examination there was no increase
in cellular content. The fluid appeared blood-tinged in one or two cases,
but this was probably caused by the accidental rupture of capillaries.
The presence of bacteria could not be detected in this fluid from any case, either by
direct microscopic examination, or by selective cultural methods.

The spinal cord showed either extensive or patchy hæmorrhage under the
meninges, hæmorrhages extending for considerable depth round the nerve roots,
and in some cases, a gelatinous exudate under the duramater.

It will be seen then, that the most important lesion consisted of what might
be termed a sub-acute inflammation of the brain, spinal cord and coverings with
hæmorrhages of varying intensity occurring chiefly under the piamater.

                          BACTERIOLOGICAL EXAMINATION.

The following materials from post-mortem cases were examined in every
case:—

         (a) Brain
        (b) Spinal cord.
        (c) Spinal fluid.
        (d) Blood.
         (e) Liver.
        (f) Spleen.
         (g) Kidney.
         (h) Bladder.
         (i) Urine.

Tissue films were prepared from all these organs and tissues, and in no case
could any bacteria be detected. The exudate which was found in the cord proved
to be negative on examination. The culture media used were :—

         (a) Blood agar.
         (b) Coagulated blood serum.
        (c) Marmorek serum medium.

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