Another sample of water from the water works was sent to Prof. Van Nuys, on May 27, 1880. He reports that the water contained much more organic matter than that in which an estimation of organic matter was made before. 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: [Illustration: Closterium Acerosum.] [Illustration: Glaucoma scintillans.] [Illustration: _a_ Monas crepusculum. _b_ Monas punctum.] The residue, organic matter, chlorine, nitric acid anhyd, and ammonia were estimated in the water received June 23d. The calcium and magnesium were estimated in the water received June 29, 1880.” Although much has lately been said regarding impure water and the startling mortality of Indianapolis, there are a great many people who persistently refuse to accept the facts and would rather submit to a large death rate than to “clean up” or go to the necessary expense of obtaining good water. The complaint is often made that doctors do not discharge their duties in warning the people against the dangers of sickness. The fact is that the medical profession gives enough wholesome advice to the public, but very few persons make practical use of the information kindly given.