Sessional_Paper_1911 — Page 215

145

No. 2 FILTER BED.

Last changed, December 31st 1910, Sand 2' deep.

First sample taken on January 3rd 1911.

Rate of filtration 500 yards gallons per day throughout.

The amounts of the samples tested were :-

rocc., occ., lcc. on to Agar plates,

bec., lcc., 2cc. on to Lactose Agar coloured plates.

1cc., 2cc., 5cc., on to Glucose N.R. Bile Salt Peptone water.

lec., 2cc., 5cc., 10cc., 20cc., 50cc. on to Lactose N. R. Bile Salt Peptone water.

Organisms isolated were worked out as given on p. 119 and are classed here on both the Coli Group" Basis and by the organisms identified.

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For unfiltered water taken on same day see previous pages