DEPARTMEXT OF MARINE BIOLOGY. 12/ 



three times as many stimuli per minute as the sense-organs engender in 

 nature, and for a short time they can maintain about 5.5 times the normal 

 rate, although this soon causes fatigue and an inability to respond to so rapid 

 a stimulation. 



Twenty-one scientific papers embodying original work, and two discus- 

 sions, were published during the year as results of investigations conducted 

 at Tortugas. Thirteen of these original papers appeared in volumes 3 and 4 

 of Researches from the Tortugas Laboratory. Publications Nos. 132 and 133, 

 published by the Carnegie Institution of Washington, the contributors being 

 Hargitt, Hartmeyer, Harvey, Hooker, Linton. jMcClendon, Mayer, Pratt, 

 Stockard, Stromsten, Tennent, Tennent and V. H. Keiller, and Vaughan. 



Eight additional researches were published elsewhere as follows : 



Westindische Seeigel und Seesterne (Tortugas echinoderms) L. Doderlein und R. 

 Hartmeyer, in Zoologische Jahrbiicher, 1910, suppl. 2, Heft 2, pp. 145-156. 



The mechanism of membrane formation and other early changes in developing sea- 

 urchins' eggs as bearing upon the problem of artificial parthenogenesis, by 

 E. Newton Harvey, in The Journal of Experimental Zoology, vol. 8, No. 4, 

 July 1910, pp. 355-376. 



Studies on the permeability of cells, by E. Newton Harvey, in The Journal of Ex- 

 perimental Zoology, vol. 10, No. 4, May 191 1, pp. 507-556, 3 figures. 



Medusae of the world, 3 volumes, 728 pp., 76 plates, 427 text-figures, quarto, by 

 Alfred G. Mayer, Publication No. 109, Carnegie Institution of Washington. 



Alexander Agassiz, by Alfred G. Mayer, in Popular Science ISIonthly, October 1910. 



Alpheus Hyatt, by Alfred G. Mayer, ibid., February 191 1. 



Polychaetous annelids from the Dry Tortugas, Florida, by Aaron L. Treadwell, 191 1. 

 Bulletin of the American Museum of Natural History, vol. 30, pp. 1-12, 29 

 figures. 



Further data on the homing sense of noddy and sooty terns, by John B. Watson, in 

 Science, vol. 32, pp. 470-473, October 7, 1910. 



In conclusion, I have pleasure in thanking Dr. E. K. Sprague, of the U. S. 

 Marine Hospital at Key West, who kindly granted the facilities of the hos- 

 pital to the steward of the Anton Dohrn during an illness, and I also wish 

 to thank Capt. E. E. Hayden, U. S. Navy, commandant of the naval station 

 at Key West, for much kindness. 



On behalf of the Department of Marine Biology, it is a privilege and 

 pleasure to acknowledge the gift of a beautifully designed silver table service 

 to the Anton Dohrn from the Miami Yacht and Machine Company, pre- 

 sented by Messrs. Lundblom and Peck, of ]\Iiami, Florida. 



Prof. Reinhard Dohrn, Director of the Xaples Laboratory, presented a 

 bronze bas-relief of his father, which occupies an honored place upon the 

 wall of the cabin of the Anton Dohrn. 



Although the year has not been unproductive of discoveries in science, it 

 should be regarded chiefly as potential in its import, witnessing as it has the 

 launching of the staunch sea-going yacht, the Anton Dohrn, and the enlarge- 

 ment of our laboratory facilities upon Loggerhead Key, Tortugas. 



