provided, having a total capacity of eighty-five gahons. A two- 

 cyHnder sixteen-horsepower Samson gasohne engine propels 

 the vessel at seven miles per hour, while in a fair breeze the 

 mainsail and jib are used. By means of a special clutch the 

 engine is connected with the gear that drives the reel on to 

 which is wound one thousand feet of hemp steel cable for taking 

 soundings, bottom deposits, water samples and temperatures and 

 to support the nets for dredging, trawling and plankton hauls. 

 A meter indicates the amount of cable used at each station. 



In the engine room a centrifugal pump has been installed 

 with which a two-inch stream of water is thrown to any point 

 desired. On long voyages living material kept in live tanks is 

 thus supplied with an abundance of fresh water. 



Me;thods and Apparatus Employed in the Survey. 



The apparatus used consisted chiefly of the following: 

 (1) A beam trawl of the usual sled runner type having a width 

 of five and a half feet. The frame is so constructed that it can 

 readily be adjusted to any width desired or can be packed in a 

 small compass when not in use. (2) An otter trawl with a 

 stretch of twenty-five feet and a bag thirty feet in length. 

 (3) A Nansen closing plankton net with number twenty mesh 

 cloth. (4) Several surface plankton nets. (5) The dredge 

 used had a width of three and a half feet. (6) A series of 

 traps, one set for deep water ; others those ordinarily used for 

 lobster fishing. (7) A series of tangles is now in process of 

 construction. (8) Large galvanized iron tanks for carrying 

 living specimens from the islands to the aquarium. (9) A 

 supply of different forms of fishing tackle, glass containers and 

 preserving fluids. (10) Sounding apparatus. 



A total of one hundred twenty-five sailings have been made. 

 During these trips, one hundred seventy-two hauls have been 

 made with the trawl ; forty-two hauls with the dredge and forty- 

 three hauls with plankton nets. 



The location of the stations at which the hauls were made 

 w^as usually determined by the use of the sextant at the begin- 

 ning and end of each haul. From this and other data the posi- 

 tion of the haul was indicated on detail maps of the U. S. Coast 

 and Geodetic survey. The time of trawling was usually one 

 half hour. In some cases one hour hauls were made and in a 

 few instances a shorter time was used. 



In the use of the trawl or dredge the launch is stopped, 

 the engine is connected with the mechanism operating the cable 

 reel. The net is dropped overboard and the sextant reading is 

 made. The launch advances slowly during thirty or sixty min- 

 utes when a second sextant reading is made. The haul is then 

 brought to the surface and emptied on a series of screen 



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