4

REPORT ON THE WORKING OF THE HARCOURT BUTLER

   Examination of rats.

   Stocking and looking after animals.

   Bacteriological examination of water for the determination of its
potability consisted in (a) determining the total number of aerobic
bacteria per cubic centimetre of water, (b) the least quantity fermenting
McConkey bile salt lactose broth, (c) presence or absence of Cl. welchii
in 20 c.c. of water, (d) identification according to Clemesha's classifica-
tion of those lactose fermenting organisms found present. The last
test is done only in the case of a water showing the presence of lactose
fermenters in less than 50 c.c. The examination of the majority of the
samples of water according to the above requirements takes about eight
days for completion. The table below shows the number of water
samples examined during the year and their sources.

TABLE.

PUBLIC WATER SAMPLES.

   Two samples of Hlawga Lake water are examined weekly, while
samples were sent monthly for examination from the following
places:—

      Maymyo.

      Pyinmana.

      Bassein.

      Moulmein.

   Water samples from newly bored tube wells are bacteriologically
examined before a permanent licence can be granted under the