454 « Bulletin American Museum of Natural History. [Vol. XXXV, 



The various kinds of apparatus used at each station are recorded in the 

 tables in chronological order, each on a separate line, opposite the station 

 number, or, in case of unnumbered stations, opposite the locality, in the 

 column "Apparatus." 



The "Position" of a station is that point occupied by the vessel, as 

 determined by the navigator at the time of beginning the first operation at 

 that station. The position of the subsequent operations under the same 

 station number corresponds in a general way to the line as indicated under 

 " Drift." The distance covered by all the operations of a station is usually, 

 however, not greater than the negligible error of observation, except in 

 stations near shore determined by bearings. In conformity with previous 

 practice, an additional position, by true bearing and distance, of some promi- 

 nent shore feature is given for each station when practicable. 



All bearings are true unless otherwise indicated. 



In the column "Chart" is noted the number and edition of the chart 

 used at each station. 



The spelling of all geographic names in these tables is that found on the 

 charts designated in the column "Chart." 



"Time of day" in the case of soundings indicates the time the plummet 

 struck bottom; in the case of dredgings, the time at which the apparatus 

 began to tow on the bottom; in the case of intermediate nets, the time at 

 which the nets started to tow at the depth indicated; in the case of surface 

 hauls, the time at which they were lowered into the water and began to be 

 towed or the current to pass through them. 



"Depth" (in fathoms) is the depth obtained by the sounding when a 

 sounding was made. In cases where no sounding was made the depth is 

 estimated from the chart, unless the station immediately follows another, 

 in which case the depth obtained at the preceding station is given. In 

 seine hauls the depths given are approximate, and represent the greatest 

 depth of water through which the seine was hauled. 



"Temperatures." The air temperatures are taken from the ship's log 

 for the hour nearest the hour entered in the time column; the same is true 

 of the surface temperatures. The bottom temperature was taken at the 

 time of sounding. All readings by Fahrenheit thermometers. 



"Density." The water density is in all cases reduced to 15' C. The 

 density of bottom water was ascertained from a sample taken by the Sigsbee 

 water bottle. 



In the double column "Trial" is indicated the depth at which apparatus 

 was worked, as well as the duration of operation. In the case of bottom 

 apparatus this latter is the time during which it is supposed to be dragging 

 on the bottom, up to the beginning of reeling in; for intermediate nets the 



