307. Feasibility of Nicaragua Route 390 308. Discovery of Lake Nicaragua 390 309. Early Maritime Commerce with Lake Nicaragua 391 310. Early Examination of Nicaragua Route 392 311. English Invasion of Nicaragua 392 312. Atlantic and Pacific Ship-canal Company 392 313. Survey and Project of Col. O. W. Childs 393 314. The Project of the Maritime Canal Company 393 315. The Work of the Ludlow and Nicaragua Canal Commissions 394 316. The Route of the Isthmian Canal Commission 395 317. Standard Dimensions of Canal Prism 396 318. The San Juan Delta 397 319. The San Carlos and Serapiqui Rivers 398 320. The Rapids and Castillo Viejo 399 321. The Upper San Juan 399 322. The Rainfall from Greytown to the Lake 399 323. Lake-surface Elevation and Slope of the River 400 324. Discharges of the San Juan, San Carlos, Serapiqui 401 325. Navigation on the San Juan 401 326. The Canal Line through the Lake and Across the West Side 402 327. Character of the Country West of the Lake 403 328. Granada to Managua, thence to Corinto 404 329. General Features of the Route 404 330. Artificial Harbor at Greytown 405 331. Artificial Harbor at Brito 407 332. From Greytown Harbor to Lock No. 2 408 333. From Lock No. 2 to the Lake 409 334. Fort San Carlos to Brito 410 335. Examinations by Borings 411 336. Classification and Estimate of Quantities 412 337. Classification and Unit Prices 413 338. Curvature of the Route 413 339. The Conchuda Dam and Wasteway 414 340. Regulation of the Lake Level 417 341. Evaporation and Lockage 418 342. The Required Slope of the Canalized River Surface 419 343. All Surplus Water to be Discharged over the Conchuda Dam 419 344. Control of the Surface Elevation of the Lake 420 345. Greatest Velocities in Canalized River 425 346. Wasteways or Overflows 427 347. Temporary Harbors and Service Railroad 427