Matric suction 



plant growth, p. 147 

 Median tolerance limit 



algicides, p. 64 



alkylbenzene sulfonates, p. 65 



defoliants, p. 64 



fungicides, p. 64 



herbicides, p. 64 



insecticides, p. 62 



toxicity reporting system, p. 56 

 Mercury compounds 



toxicity — sea water, p. 87 

 Metals industry 



industrial water, p. 187 



water consumption, p. 188, 204 



water utilization, p. 204 

 Methoxychlor 



toxicity, p. 37, 83 

 Methylene blue active substances 



Drinking Water Standards, USPHS, p. 25 



public water supplies, p. 25 

 Microcystis 



chemical composition, p. 55 

 Microorganisms 



farmstead water supplies, p. 116, 125 



pathogenic organisms, p. 89 



sea water, p. 89 



shellfish, p. 89 



stock water, p. 117, 118 

 Milk 



psychrophilic bacteria, p. 123 



water cooling, p. 120, 121 

 Milk-handling equipment 



water quality for cleaning, p. 120 

 MoUusks 



oil, p. 71 

 Molybdenum 



phytotoxicity, p. 154 

 Monuron 



irrigation water, p. 159 

 Mougeotis 



chemical composition, p. 55 

 MS see Matric suction 



Naled 



toxicity, p. 37 

 Naphthenic acid 



toxicity, p. 46 

 National goal 



aesthetics — water quality, p. 5 

 National Technical Advisory Committee on Water 



Quality Criteria establishment, p. vi 

 National Technical Advisory Subcommittee for Water 



Quality Requirements for Industrial Water Supplies, 



p. 186 

 National Technical Advisory Subcommittee on Public 



Water Supplies, p. 18 

 National Technical Advisory Subcommittee for Recrea- 

 tion and Aesthetics recommendations, p. 3 

 Navigation 



nuisance growth danger, p. 53 

 Nematodes 



Cyclops, p. 142 



Dranunculus, p. 142 



Horsehair worms, p. 142 



irrigation water, p. 160 



Strongyloides, p. 142 



water pollution sources, p. 142 

 Neutralization 



water purification, p. 128 



Neutralization (Cont'd) 



water treatment, p. 128 

 Nickel 



phytotoxicity, p. 154 



toxicity — sea water, p. 88 

 Nitella 



chemical composition, p. 55 

 Nitrogen 



major sources, p. 53 



phosphorus ratio, p. 53 

 Nuisance algae 



marine and estuarine organisms, p. 79 



nutrients, p. 51 



plant nutrient control — fresh water, p. 34 



plant nutrient control — marine and estuarine waters, 

 p. 36 



recommendation, p. 56 



wildlife, p. 97 

 Nutrient requirements 



plant growth, p. 151, 155 

 Nutrients 



algae, p. 51 



aquatic algae, p. 51 



aquatic plants and nuisance organisms, p. 77 



aquatic weeds, p. 53 



Benthic flora, p. 54 



efi^ect of increases or imbalances on algae flora, p. 54 



eutrophication, p. 5 1 



floating plants, p. 52 



imbalance effects — sea water, p. 79 



marine and estuarine organisms, p. 77-80 



nuisance algae, p. 51 



plankton, p. 51 



rooted aquatic plants, p. 52 



scum, p. 51 



submerged plants, p. 53 



Odor 



farmstead water supplies, p. 124 



public water supplies, p. 20, 21 



tainting substances, p. 48, 77 

 Odor-producing algae 



water purification, p. 129 

 Oedogonium 



chemical composition, p. 55 

 Oil 



adsorption, p. 72 



aquatic life, p. 45 



bioassay, p. 46 



Carassius carassius, p. 45 



carcinogenic substances in polluted waters, p. 73 



color as volume indicator, p. 71-72 



crude oil toxicity, p. 72-73 



Detroit River, p. 45 



effect on aquatic life — small cove, p. 71 



fresh water, p. 33, 38 



fresh water fish, p. 46 



marine and estuarine organisms, p. 36, 70-74 



mollusks, p. 71 



oysters, p. 73 



public water supplies, p. 25 



receiving water recommendation, p. 46 



sea water pollution sampling, p. 73-74 



sewage synergism, p. 71 



slick spreading prevention, p. 72 



source of pollution, p. 45 



spillage from wrecked tankers, p. 70-71 



toxicity, p. 45, 71, 72 



waterfowl, p. 38, 45 



water pollution sources, p. 70-74 



225 



