

Sect. III.] 



HYDROGRAPHY 



5 



a 



*i 



^\ 



others information which you would have wished to pes 

 sess yourself at the outset of the passage. 



( 



I 



1 



V 



u 



i.. 



C-A4^ 



B % 



'f 



i 



.. '* 



^P4li' 



1- r 



* ' 



er 





.hor 



i 



CurvenU 



s 





* 



5. It is \^ery desirable that observations upon the course 

 of the waters of the ocean should be made vvithout inter- 

 mission ; and that a continued register of the temperatur 

 of the surface, and occasionally of its submerged btrata.'* 

 should be kept, as it is only by numerous well-recorded 

 observations of this nature that we shall ever be able satis- 

 factorily to define the limits of the various zones of movin 

 water which sweep over the face of the globe, mindiir^r the 



waters of the Polar Seas with those of the equatorial re- 

 glonSj and even affecting the clLaate of extensive districts.f 

 But if from various causes a connected series cannot be 

 continued throughout these great currents, at least an 

 endeavour should be made to commence a register on 

 approaching the limits of such as are now 



defined, and to continue it while any interest appears to 

 attach to the subject : such as that of the Gulf-stream ; 

 the Trade-wind drift ; the Guinea and Equatorial currerit ; 



the Cape of Good Hope current, blending with the south- 

 east trade drift ; and the Brazil current — in the Atlantic ; 

 the Mozambique and iVgulhas current ; the Trade drift ; 

 and monsoon current of the Arabian and Bengal gulfs — 



Ocean* The remarkable Peruvian current 



Indian 



sweeping along the western coast of South America ; the 



By means of self-registcnng therniomctcrs, properly set and care* 

 fully lowered and as carefully hauled in (without jerks). 



t See Humboldt on the Climate of Peru \ ^Sabine on the Ciiinate of 

 St. Thomas Island* &c. 



