LIST OF ILLUSTRATIONS. 



Facing page 



Plate i. Buildings of Desert Laboratory, Tucson, April 13, 191 1 48 



Plate 2. Fig. i. Photograph taken on Goose Island, showing Peck's Ledge light- 

 house, etc 84 



Fig. 2. Photograph of Goose Island, at low water 84 



Plate 3. The "Anton Dohrn" at Tortugas, Florida, July 4, 191 1 120 



The "Anton Dohrn" July 191 1 120 



Plate 4. Figs, i to 4 show year-old Corals. Figs. 5 to 6 show one year's growth of 



McEandra areolata 156 



Plate 5. Figs, i to 4 show one year's growth of Mceandra areolata. Figs. 5 to 8 



show a year's growth of specimens of Porites 156 



Plate 6. Figs, i to 4 show a year's growth of specimens of Porites 156 



Plate 7. Fig. i. Upper end of 75-foot spectrograph in the 150-foot tower telescope. 166 

 Fig. 2. The Cassegrain spectrograph attached to the 60-inch reflector... . 166 



Plate 8. The 100-inch disk on the grinding machine, ready for polishing 182 



Plate 9. The magnetic work of the department of Terrestrial Magnetism, 1905-11. 



Projected cruise of the Carnegie, November 1911 to June 1913- • 208 



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