OCEANOGRAPHY 



427 



conditions are fairly homogeneous, and there is no difference worth 

 mentioning in the salinities. 



The conditions between the surface and a depth of 1,000 metres 

 along the two main lines of course are clearly shown in the two 

 sections (Figs. 11 and 12) . In these the isotherms for every second 

 degree are drawn in broken lines. Lines connecting points with 

 the same salinity (isohalins) are drawn unbroken, and, in addition, 

 salinities above 35 per mille are shown by shadmg. Above is a 

 series of figures, giving the numbers of the stations. To understand 



Fig. 10. — Salinities at Station 32 (in the Benguela Current, 



July 22, 1911), and at Station 60 (in the Brazil 



Current, August 19, 1911). 



the sections rightly it must be borne in mind that the vertical scale 

 is 2,000 times greater than the horizontal. 



Many of the conditions we have already mentioned are clearly 

 apparent in the sections: the small variations between the surface 

 and a depth of about 100 metres at each station; the decrease of 

 temperature and salinity as the depth increases; the high values 

 both of temperature and salinity in the western part as compared 

 with the eastern. We see from the sections how nearly the 

 isotherms and isohalins follow each other. Thus, where the 



