Ogle, Henry, 90. Ore (iron), 41. P Pack (for burdens), 145. Paddle-wheel, 183, 184. Paper-making, 218. Papin, Denis, 61, 178. Papyrus, 212. Parchment, 214. Parsons, C. A., 71. Pendulum, 200. Penny postage, 227. Percussion matches, 8. Pergamus, king of, 214. Pestle, 98. Phillipides, 224. Phoenicians, 171, 210. Phonograms, 209. Phosphorus matches, 11. Picture signs, 206. Pig iron, 47. Piston, 62. Plato, 194. Pliny, 76, 89. Pliny's plow, 77. Plow, history of, 73-84. Pointed arch, 137. Polybius, 228. Post, 222. Postage, 227. Postage stamps, 226. Postal systems, 223-228. Potter, Humphrey, 64, 69. Power-loom, 119. Printing, 218. Propellers, 184. Pueblo loom, 113. Q Quipu, 204. R Radiators, 25. Raft, 168. REAPER, history of, 85-96. Richaud, 22. Reed (of loom), 115. Reed (for writing), 213. Reel (for reaper), 90. Renaissance, 139. _Robert F. Stockton_, 186. Roller-mill (for flour), 107. Romans (ancient), 18, 57, 86, 134, 152, 171, 196, 215, 225. Rudder, 169, 170, 174. Rumsey, James, 180. S Safety match, 12. Safety valve, 61. Sail, 168. St. Paul's (cathedral), 139. St. Peter's (cathedral), 139. Screw-propeller, 184. Scythe, 86. Scythe cradle, 88. Self-raking reaper, 93. Self-binding reaper, 94. Seward, W. H. (quoted), 83. Share (of plow), 75. "Shay, wonderful one hoss," 153. Shed (of cloth), 113. Shuttle, 115, 116. Shuttle-race, 118. Sickle, 85. Sledge, 147. Smelting, 42. Smoke, 35. Somerset, Edward, 58. Spinning Jenny, 119. Spit (for cooking), 15. Spokes, 151. Spring (of clock), 199. Spring (of vehicle), 155. Stamps (postage), 226. Steam, 54. Steamboat, development, 177-186. Steam-carriage, 156. STEAM-ENGINE, history of, 54-72. Steam-plow, 84. Steam-turbine, 71. Steel, 51. Stephenson, George, 159. Stevens, John, 184. Stone Age, 38. Stone dwelling, 127. STOVE, history of, 13-27. Strike-a-light, 8. Sturgeon, William, 233. Sun dial, 188. Syllable-sounds, 208. Symington, William, 182. Syrian plow, 75. T Tapers, 33. Telegraph, 228-239. Telephone, 239-241. Tiller, 173. Tinder, 7. Torch, 29, 31. Tradition, 203. Travail, 147. Trevethick, Richard, 158, 162. Trireme, 172. Turbine (steam), 71. Types, moveable, 220. U United States, 80, 91, 106, 178, 180. V Vail, Alfred, 235. Vedas, 203. Vienna bread, 106. Volume, 213. W Walker, John, 10. Warming pan, 17, 22. Warp, 112. Watches, 199. Water-clock, 191-195. Water-mill, 103.