The following statement is from Prof. Van Nuys, July 14, 1880, in regard to water from the water works. Chemical and microscopic examination of water received from Dr. M. T. Runnels, of Indianapolis, on June 23 and 29, 1880:
“The organic matter in 100 cubic centimetres of the water required 5.35 cubic centimetres of the one one-hundredth normal potassium permanganate solution. In 5.35 cubic centimetres of this solution there are 1.6932 milligrammes potassium permanganate or 0.428 milligrammes oxygen was liberated, hence in one litre of the water the organic matter would require 53.5 cubic centimetres of the one one-hundredth normal permanganate solution, or 4.28 milligrammes oxygen would combine with the carbon and hydrogen of the organic matter.
| Residue (one litre filtered) heated to 180° centimetres | 473.8 |
| Chlorine | 189.3 |
| Nitric acid anhyd (N₂O₅) | 17.448 |
| Nitrous acid anhyd (N₂O₃) | a trace |
| Ammonia (NH₃) | 0.38 |
| Calcium oxide (CaO) | 128.8 |
| Magnesium oxide (MgO) | 46.2 |
| Degree of hardness, English | 21.93 |
| or, degree of hardness, German | 17.54 |
No microscopic examination was made of the water received June 23d. In that received June 29th, there were numerous flakes of what appeared to be organic bodies with granular matter, the following infusorial animalculæ were found:
Closterium Acerosum.
Glaucoma scintillans.
a Monas crepusculum.
b Monas punctum.