DISCOVERY INVESTIGATIONS 

 STATION LIST 



1935-1937 

 Plates (I-III) 



INTRODUCTION 



THIS list is a continuation of the Station Lists already published in Discovery Reports, 

 vols. I, III, IV, XXI and xxii, and it gives particulars of observations made by the 

 R.R.S. 'Discovery 11' from October 1935 to May 1937. Its arrangement follows that 

 of the Station Lists published in vols, xxi and xxii. 



Nutrient salt contents are expressed in milligramme atoms of the particular element 

 per cubic metre of sea water. For pH estimation McClendon's Standards were used; 

 a correction was made for the fading of the tubes as described in vol. xxi, and the 

 values represent the pH in situ corrected for temperature and salt error but not for 

 pressure. In the estimation of phosphate 2 c.c. of ammonium molybdate were used 

 with a trace of copper and the resulting figures corrected for salt error by multiplying 

 by a factor of 1-35. Silica was measured by the method of Atkins and Cooper and no 

 correction applied for salt error. 



Depths measured by unprotected thermometers are recorded in the column headed 

 ' Depth by thermometer ' ; those recorded in the column headed ' Depth (metres) ' were 

 determined from the amount of wire paid out and from the most probable slope of the 

 wire found by interpolation between the thermometric measurements ; the small index 

 figure placed above the figure for depth shows from which hoist of water sample bottles 

 the sample was obtained. 



Time is expressed in the 24-hour system ending with midnight (0000). The diflference 

 of the ship's time from Greenwich mean time (GMT) is noted in the ' Remarks ' column, 

 this difference holding good until another entry is made. Times in heavy type refer to 

 biological observations made between sunset and sunrise. 



The following symbols are used for nets, apparatus, etc. : 



B Oblique. 



BNR Russell's bottom tow-net. A 100 cm. net on a frame attached to skids which raise it clear 



of the bottom. 



DC Conical dredge. Mouth 16 in. diameter (40-5 cm.) with a canvas bag. 



DGP Pressure depth gauge: a modification of the Budenberg pattern. 



DLH Large dredge. Heavy pattern, 4 ft. long (1-2 m.). 



DRR Rectangular dredge bag bent on to a Russell frame with skids to raise it clear of deep 



mud on the sea floor in the neighbourhood of the Ross Ice-Barrier. 



DRS Small rectangular dredge. 



H Horizontal. 



KT Kelvin tube. 



NHP A modification of Harvey's phytoplankton net. A metal funnel (aperture 30-5 cm.) leads 



to a recording mechanism and thence to a sleeve-shaped silk net of 200 meshes to the 

 linear inch, terminating in a conical bucket. The apparatus is hauled vertically at approxi- 

 mately ID m. a minute, and the mechanism records the volume of water filtered. 



^^ ^~L\ Nets with mesh of 4 or 7 mm. (o-i6 or 0-28 in.) attached to back of trawl. 



^ 7~ -I- ) 



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



