1234 
THE VOYAGE OF H.M.S. CHALLENGER. 
Statio.v 340. 
Oagammih non 
SfRi’ACi-Xrr' 
Htatv.^ .341. 
80 fathoms, 
64-3 
225 fathoms, 
45-7 
90 „ 
Gl-5 
250 
44-3 
100 „ 
58-8 
275 
43-0 
110 „ 
56-2 
o 
o 
42-0 
120 
54-3 
400 
39-9 
130 
53 -0 
500 „ 
39-4 
140 
52-2 
600 
39-2 
150 
51-3 
700 „ 
39-0 
160 
50-4 
800 
38-8 
170 
49-5 
900 „ 
38-6 
180 
48-6 
1000 
38-4 
190 
47-7 
Bottom, 
37-6 
200 „ 
46-9 
*• 
ty at 60° F.: — 
Surface, . 
. 1 -02752 
300 fathoms. 
. 1-02575 
25 fathom.s, 
. 1-02730 
400 „ 
. 1-02637 
50 „ 
. 1-02725 
800 „ 
. 1-02562 
100 „ 
. 1-02635 
Bottom, 
. 1-02598 
200 „ 
. 1-02731 
Depth, 1500 fathoms ; deposit, Pteropod Ooze. 
At 1.15 p.M. shortened and furled sails, and proceeded under steam to sound. At 
2 P.M. sounded in 1500 fathoms. Took serial temperatures down to 1000 fathoms. The 
carbonic acid was determined in water from the surface and 800 fathoms, and amounted 
respectively to 35’3 and 43'6 milligrammes per litre. At 4.20 p.m. completed 
temperatures, and at 4.30 p.m. made sail. 
Ascension Island distant at noon, 414 miles; St Helena, 460 miles. Made good 
158 miles, .\mount of current 19 miles, direction S. 81° W. 
Surfacje Organisms. — The tow-nets near the surface yielded : — Glohigerina, 
Jlastifjerijia, Acanthometrm and compound Radiolaria, Medusae, Siphonophorae, Sagitta, 
Cgpridiua, Copepods, Phronimids, Euphausia, larval Pteropods, Appendiculana, Salpa 
(with Coccosj)hcrc8 and other minute organisms in the stomachs). 
Station 341 (Sounding 491), Tristan da Cunha to Ascension Island (see Chart 16 
and Diagram 7). 
•March 25, 1876; lat. 12' 16' S., long. 13° 44' W. 
Temperature of air at noon, 78“’3 ; mean for the day, 77°'5. 
