239 Wall of Gatun Lock Showing Arched Construction 182 240 Traveling Cranes at Work 183 241 Building a Monolith 183 242 A Culvert in the Lock Wall 184 243 Diagram of Lock-Gate Machinery 184 244 Towing Locomotive Climbing to Upper Lock 184 245 The Heavy Wheel Shown is the “Bull Wheel” 185 246 The Tangled Maze of Steel Skeletons that are a Lock in the Making 186 247 The Chagres, Showing Observer’s Car 187 248 Fluviograph at Bohio, now Submerged 188 249 Automatic Fluviograph on Gatun Lake 188 250 The Village of Bohio, now Submerged 189 251 Steps Leading to Fluviograph Station at Alhajuela 190 252 A Light House in the Jungle 190 253 The Riverside Market at Matachin 191 254 Railroad Bridge Over the Chagres at Gamboa 192 255 A Quiet Beach on the Chagres 192 256 Poling Up the Rapids 193 257 Construction Work on the Spillway 193 258 Water Gates in Lock Wall 194 259 The Lake Above Gatun 194 260 How They Gather at the River 195 261 Washerwomen’s Shelters by the River 196 262 A Ferry on the Upper Chagres 196 263 The Much Prized Iguana 197 264 Cruces--A Little Town with a Long History 198 265 A Native Charcoal Burner 198 266 The Natives’ Afternoon Tea 199 267 Piers of the Abandoned Panama Railway 200 268 Working on Three Levels 201 269 The Original Culebra Slide 202 270 Slide on West Bank of the Canal near Culebra 203 271 Attacking the Cucaracha Slide 204 272 Diagram of Culebra Cut Slides 205 273 A Rock Slide near Empire 205 274 The Author at Culebra Cut 206 275 Cutting at Base of Contractors Hill 206 276 A Rock Slide at Las Cascades 207 277 Slicing Off the Chief Engineer’s Office 208