608 



CYCLES OF ORGANIC AND INORGANIC SUBSTANCES 



2500 - 



}0O0 - 



}500 



a. 



4000 



4^00 



5'} 

 OXYGEN 



Fig. 4. Station Cavall, 1958. The crosshatched envelope includes all deep 

 results on four cruises obtained from water bottles protected against corrosion by 

 coating with Araldite. The four points are the mean of duplicates taken on the 

 November cruise with water bottles not so protected. 



been to work depths 500 m apart. In March we worked many 

 more depths than this, and we worked them in duplicate (Fig. 5), 

 in which are drawn two Hmiting curves each joining points 500 m 

 apart. Consequently, with 500-m interval sampling we would have 

 missed detail amounting to 0.1 ml/liter. 



Figure 6 presents: (a) the envelope enclosing all our results 

 in 1958; ih) the results of two cruises by the Danish Research 



