LIST OF ILLUSTRATIONS.
| [Col. George W. Goethals, U.S.A.] | Frontispiece |
| Chairman and Chief Engineer Isthmian Canal Commission. | |
| [Col. William C. Gorgas] | 144 |
| Medical Department, U.S. Army, Head of the Department of Sanitation, Ancon. | |
| [Culebra Cut, from West Bank] | 192 |
| [Gatun Locks, looking South-West] | 201 |
| [Gatun Upper Lock, looking North] | 208 |
| [Gatun Upper LockâWest Chamber] | 216 |
| [Pedro Miguel Locks] | 224 |