iVl APPENDIX, 



Near the Banks of Newfoundland, r..*. .'•..., 1027.5 



Gulph Stream, . . , 1027.5 



West Indies and Gulph of Mexico, 1027.3 



Equator Longitude 22° to 29° W. 10.7.0 



Ditto Ditto, 20° W. 1026.3 



Coast of Brazil at 10 9 from land, ,..1027.8 



Cape of Good Hope, out of the warm current, ] 026.4 



Ditto in ditto, 1027.3 



S. E. Coast of Africa and Madagascar 27° S 1027.0 



17° to 11°..., 1026.2 



10° to 0° 1026.6 



Equator to 6 s N. Longitude 55° to 60° R. 1026.5 



Thence to 16° N. do. CO" to 7t>° , 1027.5 



Mean of the whole, , , 1027.1 



Greatest difference in open sea, , OOi.6 



In both Oceans the verge of the Tropics seems to be the salttstpart of the sea_, 

 and the Equator to be in the other extreme. 



3. From the almost perfect uniformity of the sea's specific gravity all over the 

 world, no use can be made of it in aiding the navigator, except perhaps in pointing 

 cut his proximity to the mouths of rivers, which diminish the saltness to a great 

 distance from their embouchure. Off the Balasore Roads I found the specific gra- 

 vity of superficial water 1019.4, of 10 fathom ditto 1021.9; while farther at sea in 

 front of the Cuttak river, 1016. surface. In the Gulph of Mexico, the Hydrometer 

 fell 0C3.2, 30 miles in front of the river Guasalualcos, 



4. Water from a depth of 30 to 53 fathoms does not appear to be more salt than 

 that of the surface, when allowance is made for its difference of temperature. 



II. 5. The Temperature of the Ocean is calculated to be of greater use and easier 

 avail to the Sailors — it points out with great certainty the existence of a current if 

 it come from a different climate: thus in rounding the Cape in August, 1819, |00 

 miles south of the great bank I encountered the S. E. current which elevated the 

 Thermometer rapidly from 57° to 6o|°. It as suddenly declined when we had passed 

 through the stream. My brother found similar indications in the American Gulph 

 Stream. 



