18 THE DEPTH AND MAEINE DEPOSITS OF THE PACIEIC OCEAN. 



Islands the deposit was Globigerina Ooze in 1705 fathoms, and again under 

 tlie equator in 1418 fathoms, and close to Galapagos in 633 fathoms. On 

 the voyage fVom the Galapagos Islands to Aguja Point, a deep sounding 

 in 2235 fathoms gave a Red Clay, and nearer the coast, in 1036 fathoms, 

 a Green Mud was taken. On the voyage from Aguja Point out into open 

 water and thence to Callao, Red Clay was found in depths of 2370, 2600, 

 2845, 2338, and 3120 fathoms, and Blue Mud was found at 1490 and 1949 

 fathoms. On the voyage from Callao to Easter Island, the deposit 

 was mostly Red Clay, except that at 2205 fathoms, in lat. 21° 30' S., 

 long. 96°- W., a Globigerina Ooze was met with, but approximating to the 

 Red Clay, since the percentage of calcium carbonate was only 34. On 

 approaching Sala y Gomez, Globigerina Ooze was again met with in 1939 

 fathoms, with Volcanic Sand close to Easter Island. After leaving Easter 

 Island, the expedition apparently ran along the border-line between Red 

 Clay and Globigerina Ooze, although the depths varied little ; thus at 2020 

 fathoms, in lat. 25° 22' S., the percentage of calcium carbonate was 62 ; 

 then in 2188 fathoms (lat. 23° 24' S.) the percentage fell to 11, rising again 

 to 33 at 2168 fathoms (lat. 21° 39' S.), falHng again to 12 at 2265 fathoms 

 (lat. 19° 11' S.), and rising again to 41 at 2228 fathoms (lat. 17° 18' S.), 

 whence proceeding northwards the Globigerina Ooze became typical with a 

 high percentage of calcium carbonate, and continued, all the way until the 

 Galapagos Islands were approached. On the passage from the Galapagos 

 Islands to Manga Reva, the bottom was covered with Globigerina Ooze, 

 except for a most imusual sample from 2285 fathoms (lat. 6° 30' S., 

 long. 101° 17' W.), where a Red Clay containing no calcium carbonate 

 was found. At the two stations on each side, the deposit was Globigerina 

 Ooze, containing 60 per cent of calcium carbonate in 2153 fathoms, and 

 75 per cent of calcium carbonate in 2084 fathoms. One is almost inclined 

 to conclude that this sample does not represent the deposit at the bot- 

 tom, but that the shells of Foraminifera have in some way been re- 

 moved, leaving only what we call "fine washings" in the bottle. 



Immediately after leaving Manga Reva on the voyage to Acapulco, a 

 sounding was taken in 2225 fathoms (lat. 21° 4' S., long. 133° 1' W.), 

 where, according to Dr. Agassiz's preliminary report, the deposit was : " Red 

 clay mud, many mineral particles, very few GlobigeriniB, no Radiolaria or 

 Diatoms." The material received is very peculiar, being mostly made up 

 of amorphous calcium carbonate, and is quite unlike the deposit usually 



