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 UNDERSEA AMONG GIANT CORAL 

 The Dunn diving lielmet lias been a part of the equipment of the Marine Biological Laboratory 

 of the Carnegie Institution of Washington at the Tortugas, Florida, since 1915, and has been used 

 by Professor W. H. Longley in his submarine exploration work about the coral reefs. He has di- 

 rected his attention mainly to reef fishes, living several hours among them each day for weeks at a 

 time. This is not Professor Longley in the photograph, but might well be. Tliere is shown the rubber 

 hose reaching to the attendant boat at the surface, also the stream of bubbles of expired air together 

 with the excess of air pumped from above which is escaping under the edge of the hood 



— See "On the Use of the Diving Helmet in Submarine Biological Work," page 135 



