120 REPORTS ON INVESTIGATIONS AND PROJECTS. 



The masts of the Physalia had been strained in the gales of 1907 and 

 1908, and it was found necessary to renew them, and they were replaced by 

 lighter spars, thus giving a greater stability to the vessel. Other extensive 

 repairs were also made upon the yacht, and this season found her to be in 

 better sea-trim than ever before. 



The following is a list of the twelve investigators who studied at the Tor- 

 tugas Laboratory during the season, and the object and duration of their 

 visits : 



Dr. L. R. Gary, Princeton University. Development and regeneration of Actinians. 



June I to 29. 

 E. Newton Harvey, Columbia University. Membrane formation and permeability 



of eggs. June 15 to 20. 

 Prof. Dr. E. Jorgensen, Bergen University, Norway. Peridinea. May 16 to June 9. 

 Prof. S. O. Mast, Goucher College, Baltimore. Reactions of turbellaria to light. 



June 20 to July 20. 

 Dr. J. F. McClendon, Cornell Medical College. Effects of fertilization in increas- 

 ing the permeability of eggs to ions. May 5 to June 30. 

 Prof. Henry S. Pratt, Haverford College. Trematodes. June 15 to 29. 

 Dr. Frank A. Stromsten, Iowa University. Lymphatic system of turtles. June i 



to 29. 

 Prof. David H. Tennent, Bryn Mawr College. Alteration of dominance in hybrid 



echinoderms. June 15 to July 12. 

 Prof. W. L. Tower, Chicago University, and his assistant, Mr. R. K. Nabours. 



Variation and heredity in beetles. May 12 to 13; July 13 to 20. 

 Prof. A. L. Treadwell, Vassar College. Marine annehds. June 15 to July 6. 

 Dr. T. Wayland Vaughan, U. S. Geological Survey. Biology of the coral reefs. 



May 16 to June 13. 

 Prof. John B. Watson, Johns Hopkins University. Reactions of nesting sea-gulls. 



May 2 to June 21. 



In addition to the above, Dr. William H. Longley, of Yale University, was 

 collector, and Mr. K. Morita, of Japan, artist for the laboratory. 



Nine of the investigators returned this year to continue work begun in 

 previous years; and of the three new students two expect to return in 191 1. 

 It is the object of the laboratory to encourage elaborate, intensive, and accu- 

 rate studies which can not usually be completed in one season's work ; hence 

 the large number of former investigators who returned this season. 



No tropical diseases developed among those connected with the laboratory, 

 but one investigator was stricken with acute appendicitis and was taken to 

 Key West on July 6, where he remained until July 20, under the kind and 

 efficient care of Dr. E. K. Sprague of the U. S. Marine Hospital. Commo- 

 dore William H. Beehler, U. S. Navy, our constant friend of many years, 

 was also so kind as to throw his house open to the care of the patient, and 

 it is due to the generous interest in his welfare upon the part of Commodore 

 Beehler and Dr. Sprague that he recovered sufficiently to be taken to New 

 York, there to be operated upon on July 27. This unfortunate illness caused 

 us to shorten the season by at least a week ; but excepting for the studies of 

 the Director it did not interfere seriously with the researches of the investi- 

 gators who remained at Tortugas during the time the Physalia and her pa- 

 tient were in Key West. 



