LIST OF ILLUSTRATIONS. VII 



LIST OF ILLUSTRATIONS. 



Page 

 Plate i. Cocoanut Grove near the Marine Biological Laboratory at 



Tortugas, Florida Frontispiece 



2. Map of the Delta of the Colorado River, including the Salton and 



Pattie Basins 57 



3. Alkaline Slope in Area No. i, shore of Salton Sea, near Old Beach, 



California 60 



4. Desert Wash in Observational Area No. 4, occupied by an Arm of the 



Salton Sea 64 



5. View of Desert Botanical Laboratory with Plant-house 68 



6. Views of the Geophysical Laboratory, Washington, D. C 84 



7. Floor-plans of the Geophysical Laboratory 86 



8. Steel Building for the 60-inch Reflector 146 



9. Vertical Coelostat or Tower Telescope 150 



ID. Chart showing the Route of the Galilee 154 



II. Observing at Local Magnetic Pole, Treadwell Point, Alaska 166 



