"ALBATROSS" EASTERN TROPICAL PACIFIC 



EXPEDITION. 



GENERAL REPORT. 



HYDROGRAPHY. 

 Plates 1-12. 



During this expedition we sounded every day wliile at sea, and developed 

 very fairly the contour of that part of the Eastern Pacific which lies to the 

 south and west of the line from Cape San Francisco to the Galapagos and of 

 a line from the Galapagos to Acapulco, limiting an area occupied by the 

 "Albatross" in 1891. The area developed by us is included by a line over 

 3200 miles in length from Acapulco to Manga Reva, and the area north of 

 a line from Manga Reva to Easter Island and from Easter Island to Callao. 



During our voyage one hundred and sixty soundings were taken with 

 the Lucas sounding-machine. The bathymetrical chart of the " Albatross " 

 expedition of 1891^ was somewhat modified by the northern soundings of 

 our present expedition on the lines Manga Reva to Acapulco, Manga Reva 

 to the Galapagos, and Easter Island to the Galapagos. The soundings affected 

 the 2000-fathom line off the Galapagos Plateau, and off the Mexican coast 

 (PI. 1). 



The soundings of the area we surveyed in the Eastern Pacific are com- 

 paratively shallow. With the exception of the area to the westward and south- 

 westward of Callao, the soundings generally varied from 1800 to 2300 

 fathoms, while off Callao and in the direction of Easter Island are found 

 a number of soundings varying from 2000 to over 3000 fathoms (PI. 1). 



Following our lines as they developed after leaving Panama, we made a 

 straight line of soundings (PI. 1) from Mariato Point towards Chatham 

 Island in the Galapagos (PI. 4), intersecting the ring of soundings we made 

 northeast of the Islands in 1891.^ The deepest point of the line (1900 



• PI. Ill, Bull. M. C. Z. Vol. XXIII, No. 1, Feb., 1892. "■ Ibid. 



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