Salt and explosives, 18 Saltpetre, 27, 29, 30 Scott, Sir Percy, 109 Sea-planes, 287 Shell-steel, 146 Shrapnel shells, 137, 144, 145 Siemens steel, 102, 103 Sights for guns, 133 Smokeless powder, 31 Soap, 25 Sodium, 18, 22 Soluble seal used in mines, 72 Spinning action of shells, 142 Stability of aeroplanes, 293 Steam-engines, 170 Steel for guns, 126 Sulphuric acid, 31, 32, 150 Suspension bridges, 83 "Tanks," 276 Telephone used in telegraphy, 266 Tin, 152, 153 T.N.T., 35 Toluene, 35 Torpedo boats, 184 Trajectory, 122 Trench mortars, 118 Trestle bridges, 80, 83 Tri-nitro-benzene, 35 Tri-nitro-phenol, 35 Tri-nitro-toluene, 35 Tungsten, 105, 153 "Tuning" wireless telegraph apparatus, 255 Turbine, steam, 17 Uranium, 41 "Whitehead" torpedo, 215 Wire-wound guns, 128 Wolfram, 153 Wood spirit, 57 Wrought iron, 97 _Wyoming_, U.S. battleship, 195 X-rays, 42, 43 Zeppelin _v._ aeroplane, 46 Zinc, 149, 150, 151 PRINTED BY WILLIAM BRENDON AND SON, LTD., PLYMOUTH, ENGLAND. 1917 _Great Classics for Little Children_ THE CHILDREN'S ODYSSEY TOLD FOR LITTLE CHILDREN BY PROF. A. J. CHURCH, M.A. _With Fourteen Illustrations. Extra Crown 8vo, 5s._ "A really charming volume in all respects. No writer has done work of this kind so well since Kingsley first set the fashion in his masterpiece, _The Heroes_."--_Guardian._ "The stories could not be told more simply and directly, or in a way better fitted to delight and interest children, than they are in this charming book. We are delighted to see the book embellished with Flaxman's exquisite illustrations. Greatly daring ... they have been coloured in simple colours, like those of classical wall paintings. The effect is quite excellent."--_Spectator._ THE CHILDREN'S ILIAD TOLD FOR LITTLE CHILDREN BY PROF. A. J. CHURCH, M.A. _With Fourteen Illustrations. Extra Crown 8vo, 5s._ "What need nowadays to praise Prof. Church's skill in presenting classical stories to young readers? This is a capital example of the cultured, simple style. A delightful gift-book."--_Athenæum._ "Prof. Church has written as good a book as can ever be produced for English children from the literary treasures of Greece. The illustrations are worthy of the writing."--_Sheffield Independent._ "With delightful simplicity of style Prof. Church retells the story of the Siege of Troy so that it ceases to be 'history,' and becomes an engrossing narrative. The handsome volume has a dozen excellent illustrations."--_Dundee Courier._ THE CHILDREN'S ÆNEID TOLD FOR LITTLE CHILDREN BY PROF. A. J. CHURCH, M.A. _With Fourteen Illustrations in Colours. Extra Crown 8vo, 5s._ "Professor Church has probably done more than any other man living to bring the classics of Greece and Rome within the comprehension of young folks. He has a simple style that must be the envy of writers for children."--_Dundee Advertiser._ "A delightful gift-book."--_Athenæum._