Linnean Society x _Lithodomus_, boring mollusc 101 Lithothamnia, stony seaweeds 110 Luxuries, native 55 Mabrûk, Swahili slave 20 Makawar Island 134, 135, 138 Manufactures 80 Maritime plain 3, 10, 127 Marital relations 32, 73 Medical ideas 47, 78 Medicine, ink as 43 Milking 44 Mohammedanism 33 Mûled dance and service 40 Murray, Messrs x Nationalities on coast 15 Negroes 17 Newness (geologically) of Red Sea coast 132 Ornaments 24, 25 Osman Digna 20, 27 Pearling 65 Pearls, from _Tridacna_ clams 69 theory of origin of true pearls 44 _Pholas_, coral borer 103 Plant and animal interchange of oxygen 94 _Porites_—see Corals Porpoise 45 Port Sudan 1, 9, 133, 146 approach by sea 1, 136 reefs at 83, 100, 103 Port Sudan-Atbara route to Khartum ix Prayer 39 _Pseudoscarus_ 101 Rainfall 120 Rain squall 7 Raised shore-lines 134 Rawaya peninsula 127, 131, 138, 145 Reefs, coral Australian Barrier 117 classification of 113 constituents 99, 131 elevated above sea 83, 131 form of surface 104 fringing and barrier 1, 113, map 137 growth of 100, 105 living of Red Sea 152 origin by abrasion 106, 140 origin of atolls 114 pictorial 5, 8, 92 sandstone, Alexandria 111 sandstone, Cape Verde Islands 110 Zanzibar 89, 109 Religion 33, 35 Rift Valley, the Great 122 step formation of sides 122, 143 Rising and sinking lands 133 Sailors, Arabian 59 Hamitic 65 Salak 127, 141, 149 _Sambûk_ (or dhow) sailing vessel 59 Sand-eating animals 103 Sandstone hills 129 Sanganeb lighthouse 10 atoll reef 124 Sea gardens 8, 92 Seaweed, stony 100 Sexual morality 26, 32 Shêkh Barûd (Port Sudan), stories of 37 Shêkhs, living 27 as dead saints 36, 38 Shinab Harbour 147 Shubuk reefs 150 Slaves’ stories 19 Social relations 32 Songs of labour 31 Sting rays or devil fish 70 Suakin 10, 13, 146 archipelago 9, 150 Subsistence of natives 50 Sunset land 8 Superstitions, native 42 British 49 Tella Tella Island 154 Tents of nomads 53 Têtâwib hill 143 Tides of Red Sea 121 Tokar, dervish stronghold 20 oasis, delta of Baraka floods 151 Travel by sea 150 Trinkitat 150 _Tubipora_ 110 Uganda railway, crossing Rift Valley 124 Utensils 55 Vegetation 3, 52 _Vermetus_ 110 Volcanoes 123 Warning coloration of sting rays 71 Wedding and Arabian sword dances 57 Wiai harbour 148 Women, personality and influence 24, 73, 81 _Xenia_ 151 Yemêna ravine and oasis 130 Zanzibar reefs 89, 109, 117 CAMBRIDGE: PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PRESS. _Plate II_ [Illustration: Fig. 2. Map of Red Sea] FOOTNOTES: [Footnote 1: For the story of Shêkh Barûd’s death see p. 37.] [Footnote 2: _Acacia tortilis_.] [Footnote 3: A species of _Carex_ I believe.]