Neolithic times, 1 Nikolaiewa, 95 Nitrogenous constituents of milk, 52 O Ojràn, 106 Olein, 51 Oxygala of Pliny, 4 P Paleolithic times, 1 Palmitin, 51 Pasteur, 14, 78 Pasteurisation, 78 Pelouze, 17 Pilaff of rice, 5 Pina, 21 Podowyssowski on keffir, 87 Preparation, of soured milk, 81; in the house, 125; in the dairy, 139 Primary cooler, 78 Proteids, 53 Pyrenees, 4 R Reindeer's milk as soured milk, 8 Rubruquis, William de, 19 S _Saccharomyces cerevisseæ_, 90 _Saccharomyces keffir_, 32, 33, 91, 93, 94 Sakwaska, 88 Sale of Food and Drugs Act, 1899, 49 Scheele, 17 Scholl on keffir, 91 Scythians, 18 Secondary cooler, 79 Shammar Bedouins, 2 Sheneena, 2 Skolotowski on keffir, 86 Smith, Professor Robertson, 3 Soured milk, in the house, 125; in the dairy, 139; in health and disease, 151; from impure cultures, 158; use of, 159 Souring of milk, 47, 54 Specific gravity of milk, 65 Stearin, 51 Steriliser, 148 _Streptobacilli lebeni_, 39 _Streptobacillus lebenis_, 111 _Streptococcus a_, 93, 94 _Streptococcus acidi lactici_, 95, 96 _Streptococcus b_, 93, 94 _Streptococcus lacticus_, 92, 93, 122, 124 Sugar of milk, 54 Sugar preparations and the soured-milk bacillus, 137 Suter-Naef on Swiss koumiss, 26 Swedish whey cheese, 60 Swiss hard cheese, 113 Symptoms of disease, 161 T Temperature allowances when testing milk, tables of, 66 Town's dairy equipment, 80 Transmission of disease by milk, 72 U United Kingdom, milk supply of, 69 United States, milk industry of, 71 Urgoutnik, 43 V Van Leeuwenhoek, 13 Variation limits of milk, 49 Vedas, 1 "Veronelle" apparatus, 132 Vina, 21 Vinous fermentation, 17 W Willows Refrigerating Company's apparatus, 144, 145 Wilson on koumiss, 23 Y Yoghourt, 9, 42, 46, 107 Yoghourt bacillus, 109 Z Zakvaska, 42 * * * * * Putnam's Science Series 1. +The Study of Man.+ By A. C. HADDON. 2. +The Groundwork of Science.+ By ST. GEORGE MIVART. 3. +Rivers of North America.+ By ISRAEL C. RUSSELL. 4. +Earth Sculpture, or; The Origin of Land Forms.+ By JAMES GEIKIE. 5. +Volcanoes; Their Structure and Significance.+ By T. G. BONNEY. 6. +Bacteria.+ By GEORGE NEWMAN. 7. +A Book of Whales.+ By F. E. BEDDARD. 8. +Comparative Physiology of the Brain, etc.+ By JACQUES LOEB. 9. +The Stars.+ By SIMON NEWCOMB. 10. +The Basis of Social Relations.+ By DANIEL G. BRINTON. 11. +Experiments on Animals.+ By STEPHEN PAGET. 12. +Infection and Immunity.+ By GEORGE M. STERNBERG. 13. +Fatigue.+ By A. MOSSO. 14. +Earthquakes.+ By CLARENCE E. DUTTON. 15. +The Nature of Man.+ By ÉLIE METCHNIKOFF. 16. +Nervous and Mental Hygiene in Health and Disease.+ By AUGUST FOREL. 17. +The Prolongation of Life.+ By ÉLIE METCHNIKOFF.