DIAGRAMS[A Graphic Illustration of the Material Handled at Panama]25[A Cross Section of the Gatun Dam]35[Plan of the Gatun Dam and Locks]36[A Profile Section of the Canal]40[From a Model of Pedro Miguel Lock]48[A Cross-section of Locks, Giving an Idea of Their Size]49[One of the 92 Gate-leaf Master Wheels]64[A Mauretania in the Locks]67[ The Effect of Slides]72[ Average Shape and Dimensions of Culebra Cut]75[The Corozal and its Method of Attack]85[International Shipping Routes]351[A Map Showing Isthmus with the Completed Canal]379