ngers, 249.

Mercury as a disinfectant, 324.

Metchnikoff's theory of auto-intoxication, 233.

Methods of collection of water, 153;
of securing fall for hydraulic rams, 175.

Milk, and its adulteration, 419;
and its care, 233;
and typhoid fever, 358;
of lime, 325;
supply of Rochester, N. Y., 237.

Milk-pail for clean milk, 245.

Mineral matter in water, 132.

Minimum rainfalls, 100.

Mixing concrete, 66.

Moisture and its dangers, 39.

Montclair typhoid epidemic, 359.

Mosquitoes, and malaria, 380;
and yellow fever, 387.

Mount Savage typhoid epidemic, 357.

Mouth breathing, 287.

Muslin cloth to prevent drafts, 81.

Narrow-topped milk-pail, 245.

Natural immunity, 310.

Need for rural hygiene, 21.

Newton, Mass., water used in, 92.

New York State, death-rates in, 6.

Night air and malaria, 26.

Objectionable construction work at a spring reservoir, 154.

Objections to brooks as source of water-supply, 125.

Occupation and disease, 301.

Old age mortality in the country, 20.

Openings for ventilation, size of, 85.

Organic matter, in soil, 38;
in the air, 76.

Outfall for cellar drain, 52.

Outlet, for drains, 47;
for foul air, 81.

Ownership in streams, 415.

Oxygen in the air, 75.

Oysters and typhoid fever, 361.

Pancreatic juice and digestion, 261.

Parasites as causes of disease, 302.

Pasteurization for typhoid fever, 352.

Patented disinfectants, 317.

Patent medicines, 276.

Peeling, in measles, 373;
in scarlet fever, 369.

Pellagra, 391.

Pipe lines, 165.

Plank dam, 159.

Pleasure in eating, 270.

Plumbing, 189;
and heating, 190;
and water consumption, 93.

Pneumonia, 333;
germ, 344;
in the country, 20.

Pollution, of streams, 211;
of water, 414;
of water by animal matter, 136;
of wells, 142.

Ponds or lakes as water-supply, 127.

Position of fresh-air inlet, 81.

Precautions on part of consumptive, 337.

Preparation of rabies antitoxin, 309.

Pressure for water-supplies, 128.

Pressure tanks, 186.

Prevention of pneumonia, 346.

Principle of hygienic law, 411.

Privy, construction of, 61.

Process of bacterial attack, 307.

Production of diphtheria antitoxin, 403.

Protection, against mosquitoes, 385;
against smallpox, 398.

Proteids in food, 260.

Ptomaines, 250.

Pump for deep well, 106.

Pumping water, 168.

Purity of water-supply, 131.

Quantity of water in sta