SUMMARY OF RESULTS. 
1233 
Density at 60° F. : — 
Surface, 
. 1-02775 
200 fathoms, 
. 1-02582 
25 fathoms, 
. 1-02715 
300 
. 1-02.559 
50 „ . . 
. 1-02697 
400 
. 1-02560 
100 „ 
. 1-02639 
Bottom, 
. 1-02568 
Depth, 1415 fathoms ; deposit, Pteropod Ooze, containing 95'61 per cent, of 
carbonate of lime (see Murray and Renard, Deep-Sea Deposits Chall. Exp.). 
At 8 A.M. got up steam. At 9.40 a.m. shortened and furled sails, and proceeded 
under steam to sound. At 10 a.m. sounded in 1415 fathoms. The sounding-tube sunk 
ten inches into the bottom, and brought up over a litre of the ooze ; many of the 
Pteropod, Heteropod, and Foramiiiifera shells were coloured black or brown by the 
oxides of manganese and iron. Took serial temperatures down to 1000 fathoms. The 
carbonic acid was determined in water from 400 fathoms, and amounted to 
43 ‘6 milligrammes per litre. At 12.30 p.m. completed observations and made sail. 
Ascension Island distant at noon, 570 miles ; St. Helena, 480 miles. Made good 
134 miles. Amount of current 8 miles, direction S. 83° W. 
Surface Organisms. — The following species is recorded from the surface at this 
Station : — 
Organisms from 
Surface-Xets. 
Pteropoda (Pelseneer, Zool. pt. 65). 
Clio {Creseis) acicula (Rang). 
The tow-nets at the surface and down to 100 fathoms yielded among other 
organisms : — Hastigerina, Acanthometrse, Polycystinse, and compound Radiolaria, 
Medusae, Siphouophorae, Cypridina, Copepods, and Amphion. 
Station 340 (Sounding 490), Tristan da Cunha to Ascension Island (see Chart 16 Station .340. 
and Diagram 7). 
March 24, 1876 ; lat. 14° 33' S., long. 13° 42' W. 
Temperature of air at noon, 77°'8 ; mean for the day, 76°7. 
Temperature of water ; — 
Surface, . 
77-2 
40 fathoms, . 
74-1 
10 fathoms. 
77-0 
50 „ . . 
72-3 
20 „ . . 
76-4 
60 „ . . 
69-8 
30 „ . . 
75-7 
70 „ . . 
67-3 
