Io8 REPORTS ON INVESTIGATIONS AND PROJECTS. 



among the lighthouse keepers or their famihes during the many years 

 that the Hghthouse has been maintained on Loggerhead Key. In order, 

 however, to insure against the possible introduction of tropical fevers our 

 cisterns are rendered mosquito-proof, modern plumbing is introduced, 

 and all refuse from the kitchen is daily towed out to sea. No mosquitoes 

 breed upon Loggerhead Key, but in order to afford protection against 

 those Vv'hich are carried upon the island by the wind, mosquito nets of 

 the best pattern are provided, so that investigators may enjoy all possible 

 protection. Whenever the wind blows from the direction of the Florida 

 Keys a few Culex mosquitoes appear, although these must be blown at 

 least 4o miles from the Marquesas Keys in order to reach the Tortugas. 

 After arriving at Tortugas there is practically no danger of contracting 

 any tropical disease, but in order to warn students of the dangers one 

 may expect to encounter in hot, crowded, tropical cities, the following 

 circular was issued to each investigator who purposed to visit Florida 

 in summer: 



SUGGESTIONS FOR CARE OF HEALTH IN THE TROPICS. 



These suggestions apply especially to life in tropical cities such as Key West, Tampa, 

 Miami, New Orleans, or Havana. At Tortugas, Florida, no unusual precautions are 

 necessary, for the islands are securely isolated from infectious diseases, and no 

 mosquitoes breed upon Loggerhead Key. 



1. Go to bed as soon after sunset as possible, and always sleep under a mosquito 

 bar. Examine the mosquito net before nightfall, and kill all mosquitoes entrapped 

 under it. Then tuck the net in all around the mattress. 



2. Drink only boiled or imported waters. If you can not obtain these, put lime or 

 lemon juice into the water. Do not drink too much ice-water. 



3. Rest for a few days when you first arrive in the tropics. Do not exercise too 

 actively or remain too long in the hot sun. 



4. Eat peeled or cooked fruits, but avoid raw, unpeeled fruit. 



5. Any excess in the tropics is attended by more serious consequences than in tem- 

 perate regions. 



The following investigators pursued researches at the laboratory dur- 

 ing the season : 



Prof. W. K. Brooks, of Johns Hopkins University, March 15 to April 2. 



Dr. Leon J. Cole, of Harvard University, May 31 to June 20. 



Dr. R. P. Cowles, of Johns Hopkins University, June 22 to July 20. 



Prof. Ulric Dahlgren, of Princeton University, June 22 to July 20. 



Dr. C. H. Edmondson, of Iowa University, June 19 to July 20. 



Mr. Carl Kellner, of Johns Hopkins University, March 15 to July 20. 



Prof. Edwin Linton, of Washington and Jefferson College, June 28 to July 20. 



Dr. Charles Zeleny, of Indiana University, June 12 to August i. 



The duration of the average visit to the laboratory was forty days. 

 Hitherto it has been necessary to close the laboratory before August i, 

 for by the terms of her insurance the Physalia must be laid up in a safe 



