Part 47

Dilution (bacteriological), 98.

Dissolved oxygen, 65.

Effluents, relative stability of, 69. biochemical, oxygen, demand of, 71.

Endo’s medium, 97.

Erythrosine indicator, 36.

Ether—soluble matter, 69. in sludge and mud, 75.

Evaporation, 29.

Expression of results (see under “Results”).

Fat, determination of, 69, 75.

Fecal and non-fecal members, colon group, 106.

Fermentation tubes, 93.

Ferrous sulfide in sludge and mud, 76.

Ferrous iron, determination of, 47.

Ferric iron, determination of, 48.

Fineness, coefficient of, 8.

Gelatin media, 94, 96.

Hardness, determination of, 30. bicarbonate, 37. carbonate, 38. hydroxide, 38. non-carbonate, 34. temporary, 34.

Hydrogen sulfide, determination of, 63.

Hydrogen-ion determination, 94.

Ignition, loss on, 30.

Incubation, 99.

Indol test, broth for, 107.

Indicators, 36, 94, 107.

Iodine and bromine, determination of, 61.

Iron and Aluminium, separation, 57. analysis of, 79.

Iron, determination of, 43. standards, 45. sulfate, determination of, 41. analysis of, 81.

Lacmoid indicator, 36.

Lead, determination of, 51, 55.