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162 Odours,   Theories of, 98 Chemical, 116, 132 Undulatory theory of, 42, 116, 120 Criticism of, 129 Varieties of, 100 Ogle, 116 Olfaction. See also. Altusions to, in literature, 51 et seq. and digestion, 136 a primitive sense, 21 Evolution of, 21 in fish, 33 in insects, 25 in the lower animals, 21 in the sex-life, 85 Theories of, 98 et seq. and ventilation, 17, 109 Olfactory cells, 23 hairs, 23, 121 memory, 43 organ, 23 of insects, 28 pictures, 140 et seq. pigment, 24, 116, 125 region of nose, 114 Onions, effect of, 94 f.n. Orientation. See Homing Instinct.

, 70 Paris, Smell of, 151 Parker, G. H,, 100, 104, 108 Pawlow, 136 Peppermint, 71 Perfumes, Classification of, 103 New varieties of, 107 Sources of, 105 Pigment, Olfactory, 24, 125 Pinewood, Odour of burning, 143. Plague, Sweet smell of, 84 Poncelet, P. P., 59

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, Objective, 137 Religion, Smell in, 72 Remedies, Nauseous, 70 Olfactory, 66 Rheumatism, Acute, Acid smell of, 83 Ribot and Olfactory memory, 48, 50 Rimmel, Classification of odours, 103 Roberts, Lord, and cats, 92 Rohmer, Sax, 74 Rose perfume, 57, 105 and exhaustion, 16 Roses, Attar of, 105 Rousseau, 100, 141

, Savour of, 72 Saints, Odour of the, 74 Saintsbury, George, 103 Salerno, Teaching of, on garlic, 47 Salmon's Dispensatory, Fumigation in, 68 Sandal-wood, 113 Scatol 16, 70 Scott, Sir Walter, 67 Sea, Smell of, 144 Sea-anemone, Olfactory cells of, 24