N 50 50 cm. tow-net. Mouth circular, 50 cm. in diameter (19-5 in.) : 200 meshes to the Unear 



inch. 

 N 70 70 cm. tow-net. Mouth circular, 70 cm. in diameter (27-5 in.) : mesh graded, at cod-end 



74 to the linear inch. 

 N 100 I m. tow-net. Mouth circular, i m. in diameter (3-3 ft.): mesh graded, at cod-end of 



stramin with 10-12 meshes to the linear inch. 

 N 450 4|- m. tow-net. Mouth circular, 4J m. in diameter (14-8 ft.): mesh graded, cod-end of 



7 mm. (0-28 in.) netting, lined for part of its length with 4 mm. (o-i6 in.) netting. 

 ND Dip net. A circular frame 2 m. in diameter (6-6 ft.) with a very shallow bag of coarse 



netting. Used on the bottom in shallow water with bait lashed to the centre of the netting. 

 NH Hand net. 



OTL Large otter trawl. Head-rope 40 ft. long (12-2 m.): mesh at cod-end ij in. (3-2 cm.). 



Sh. Coll. Shore collecting. 



TD Transparency (or Secchi) disc, 50 cm. in. diameter (19-5 in.). 



TN Fish-trap. Rectangular, with | in. wire netting. 



TYF Young-fish trawl. A bag of stramin, with 10-12 meshes to the linear inch, attached to a 



circular frame 2 m. in diameter (6-6 ft.). 

 V Vertical. 



To the symbols for tow-nets (N 450, N 100, N 70, N 50 and TYF) B, H or V is always 

 added to indicate the direction in which the haul was taken. For determining the depths 

 of horizontal and oblique nets, Kelvin tubes or depth gauges were constantly employed. 

 Their use is indicated by symbols in the " Remarks " column, and where no such symbol 

 appears it is to be understood that the depth was estimated. 



Time is expressed on the 24-hour system, the day ending with midnight (0000). In 

 the list for the ' Discovery II ' the difference* from Greenwich mean time is noted in the 

 "Remarks" column, this difference holding good until another entry is made. In the 

 ' William Scoresby ' list the times are approximately local apparent time. In the columns 

 for Biological Observations the entry under "from" states the time when all the warp 

 was paid out. That under "to", with bottom nets and horizontal tow-nets, gives the 

 time when hauling began ; with oblique nets, or with any which were closed, the time is 

 that when the haul ended — either by closure, or by arrival at the surface. When nets 

 were hauled in the dark, the times are printed in heavy type. 



At the end of the lists (p. 230) will be found a summary of the stations made by the 

 'Discovery 11' and 'William Scoresby' with references to the charts on which the 

 positions are marked. 



* To convert ship's time to g.m.t. the figure in the "Remarks" column is to be added or subtracted 

 according to sign. 



