130 



Papers from the Department of Marine Biology. 



sufficient to furnish the author with material for physiological work 

 during two seasons at the laboratory and a large number are still left. 

 From the middle of this island to the narrow tidal gut separating the 

 eastern from the western island there is again a mixture of Uniola, 

 Tournefortia, Cenchrus,Atriplex, Sesuvium, and a little Sccevola. North 

 of the portion across the inlet there is an association similar to this 

 latter group, with the addition of Cyperus brunneus and Chamcssyce in 

 large amount. 



Following the curve of the western island as it bends south, the vege- 

 tation as plotted on the map is very sparse. It is this shore which gets 

 the full sweep of the wind and waves from the northwest. The surface 

 here is mostly heaps of coarsely broken corals and shells, and the 



+ 1. Cakile lanceolata. 

 iK 2. Iva imbricata. 

 O 3. Scaevola plumieri. 



Sand or Hospital Key. Two inches = 

 one-fifth statute mile. 



H- 1. Cakile lanueolatu. 



Middle Key. Two inches: 

 one-fifth statute mile. 



plants it supports are a few Sesuvium clumps, Suriana and Tourne- 

 fortia bushes, and Cakile. The Suriana is seen only on the leeward side 

 in the more sheltered coves of the shore. In concluding the observa- 

 tion on these islands one can only state, in the light of Lansing's survey, 

 which records them as barely emerged from the sea, that all the above 

 vegetation must have appeared on them in the 12 years that have 

 passed since 1904. 



SAND OR HOSPITAL KEY. 



Stretching eastward from Garden Key and separated from each 

 other by almost equal distances are Sand, Middle, and East Keys. All 

 three are small and only the easternmost one, East Key, supports any 

 real covering of vegetation. Sand Key, which is also said to have been 

 used for hospital purposes during the yellow-fever plague of the late 

 sixties, is only about 90 feet long and half as wide, and consists entirely 

 of blistering and glaring white coral sand. It was visited at various 



