DEPARTMENT OF MARINE BIOLOGY. 



127 



is hoped that this research may eventually throw some light upon the possible 

 efficacy of sea-water or of some of its normally present organic or inorganic 

 constituents in serving as a source of food for marine animals. It will, 

 however, be necessary to devote several months to a detailed study of the 

 results of the experiments before conclusions should be drawn. 



In addition to the studies mentioned above, Prof. Ulric Dahlgren, of 

 Princeton University, was enabled to visit Norfolk, Virginia, to continue 

 his studies upon the development and histology of the electrical organs in 

 Asteroscopus. 



As a consequence of readjustments following the hurricane of October 17, 

 1910, the sandy shore of Loggerhead Key has moved westward and north- 



# 



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: <i'.\ 









Effects of Hurricane of October 17, 1910, at Loggerhead Key. 



Looking northward from top of light-house. Full line shows shore-line as it was in 

 July 1905 ; dotted line shows shore as it was in July 1912. 



ward, and the end of our laboratory dock on the western side of the island, 

 which in 1905 projected at least 34 feet beyond the shore line, is now 5 feet 

 inward from the edge of the water at low tide. There is now less than 2 

 feet of water near the end of our dock in a place where, according to Dr. 

 Vaughan's measurements, there was a depth of 8 feet in 191 1. The labo- 

 ratory buildings, which in 1909 were nearer the western than the eastern 

 side of the island, have now become reversed in this relation, the island as 

 a whole having gone to the westward. It may prove to be necessary in 1913 

 to extend our western dock and to build new dock-houses. The outline 

 drawing published herewith has been traced from two photographs, each 

 taken from the same site at the top of the lighthouse, the first in July 1905 



9 — YB 



