20 'Al.l'.ATROSS" EASTERN TROPICAL PACIFIC EXPEDITION. 



to Easter Ishand, Easter Island to the Galapagos, and Galapagos to Manga 

 Reva, developed the course and width of the Humboldt current, while the line 

 from Manga Reva indicated its western extension and the position of the 

 equatorial current to the west of the Galapagos. The temperature conditions 

 of the Panamic district were observed by the " Albatross " in her expedition 

 of 1891, and were noted in my general sketch of the cruise.^ 



Beginning with a line running in a northwesterly direction from Aguja 

 Point (PI. 7) towards the Galapagos, we find at 50 fathoms, at the three 

 eastern stations, a nearly uniform temperature, varying between •57°.8 and 

 58°.8, while at a western station the temperature at that depth was 62'.5. 

 The belt of 60' begins at about 25 fathoms near the coast and widens to 75 

 fathoms towards the west. At 100 fathoms the temperature is between 54°. 9 

 at the western station and 57*^.5 near the coast, and the belt of water adjoin- 

 ing the coast maintains its greater temperature to a depth of 800 fathoms, 

 the cold belt of 38' and 40" rising as we go west. Yet the surface tempera- 

 ture is colder towards Aguja Point. It is 64' at Station 4652, 67° at Station 

 4651, rising to 71, 71°.5, 72°, 75°.2, 77°, and reaching 78°.5 as we proceed 

 westward from Station 4652 to Stations 4649, 4647, 4646, 4523*, and 4539*. 

 Between Station 4651 and Stations 4647 and 4713 the rapid fall of tempera- 

 ture from the surface to 50 fathoms is very striking, falling from 67° to 58°.8 ; 

 71° to 57°.8 ; 71°.5 to 58°.6 ; 75°.2 to 62°.9, or varying between 8'.2 and 13°.2 

 (PI. 6, fig. 2). 



In a section from Aguja Point in a southwesterly direction (PI. 6, fig. i) 

 from Station 4655 to Stations 4662, 4701, the surface temperature gradually 

 rises as we pass westward. Near the coast it is 65° at Station 4654, 67° at 

 Station 4655, 70° at Station 4658, 69' and 69.4 at Stations 4660 and 4662, 

 and it rises to 74°.7 at Station 4701. The temperature curves of 60°, 50', 

 40° and 38° are at about the same depths as those of the more northern line. 



A line about west of Callao to Station 4535*, nearly 2750 miles from 

 Callao, shows the same increase in surface temperature (PI. 9). At Stations 

 4509* and 4670, about 80 miles from the coast at the western edge of Milne- 

 Edwards Deep, it is 67°; it has risen to 69° at Station 4666, to 69°.4 at 780 

 miles from the coast, at Station 4662, to 72°.7 at Station 4707, to 76°.7 at 

 Station 4724 on the Albatross jjlateau, and to 80° at Station 4535*. The 

 body of water having a temperature above 38 is larger north at Aguja Point 



* General sketch of the expedition of the " AUiatross " from February to May, 1891, Bull. Mus. 

 Comp. Zool. XXIII, No. 1, p. 12. 



