6 U. S. BUREAU OF FISHERIES. 



mometers have not been standardized. The bottom temperatures 

 and those marked by an asterisk represent the corrected readings of 

 tested Neo"etti-Zambra thermometers used in appropriate trip cases. 



On the Lower Cahfornia cruise, 1911, ''Density" was determined 

 by sahnometer tests. "Sahnity " determinations have all been made 

 by titration with the standard outfit supplied by the International 

 Council for the Exploration of the Sea. 



The "Depth" of the "Trial" is that at which the gear was used, 

 and under "Drift" are given the "Direction" and "Distance" 

 through which the dredge was hauled. These are approximations. 

 The "Duration" is the length of time consumed in towing the appa- 

 ratus or the length of time allotted to a "set." 



The current velocities given for stations H. 5351-H. 5365, inclusive, 

 represent the readings of a Price current meter, which has been tested 

 by the U. S. Bureau of Standards. 



ABBREVIATIONS AND SYMBOLS. 



The abbreviations and symbols used in the tables are listed below. 

 For convenience the abbreviations used in describing the character 

 of the bottom are listed separately. 



9^ Ag 9-foot Agassiz beam trawl, including one tail weight and two wing 



weights; three glass floats; and a 150-pound sinker above the 



bridle, unless otherwise stated. 



VI' Ag 12-foot Agassiz beam trawl, rigged as above. 



Alb. smp Albatross bottom-sampling apparatus. (Described on pp. 16-18, 



University of California Publications in Zoology, vol. 14, No. 1, 



pis. 12, 13. Berkeley, 1914.) a 



botm bottom. 



botm. net frame, Welsh-Helgoland; net, strainer top. No. 10 silk bottom. 



C collecting station. 



clsg. net Bigelow frame, meter net, No. 000 top, No. bottom. 



80^ cod 80- foot cod trawl, otter rigged. 



C. S U. S. Coast and Geodetic Survey. 



D dredging or trawling station. 



19^^ dr 19-inch boat dredge. A fine-meshed net bag covered with a canvas 



bag, the mouth of which is held open by an iron frame 19 inches 



long by about 6 inches wide. 



dyn dynamite. 



Ek. bot Ekman reversing water bottle. 



Ek. mtr Ekman current meter. 



Ek. smp Ekman bottom-sampling apparatus. 



El. sdr electric (Weule) sounding machine. 



SO' fldr 30- foot flounder trawl, otter rigged. 



IW fldr 75-foot flounder trawl, otter rigged. 



GB bot Greene-Bigelow water bottle. 



H hydrographic station. 



Helgo.net square frame of Helgoland; net, strainer top, No. 10 silk bottom; 



used as surface net. 



H. O U.S. Hydrographic Office. 



Hvg. In heaving line and lead. 



\' inter townet made of No. 000 silk, mounted on 4S-inch metal ring. 



Inter, sal intermediate salinity. 



Inter, temp intermediate temperature. 



L left thermometer (looking toward the instrument). 



25-lb. lead "I 



28-lb.lead 



30-lb. lead >cone-shaped sounding lead armed with soft soap. 



32-lb. lead 



35-lb. lead j 



Lt light. 



Luc. sdr Lucas sounding machine, including a 35-pound detachable iron shot, 



unless otherwise stated . 



