148 
THE VOYAGE OF H.M.S. CHALLENGER. 
Station 10. 
Organisms* from 
Sibfacb-N’kth. 
Station 10 (Sounding' 54), Tenerife to Sombrero (see Chart 6 and Diagram l). 
February 28, 1873 ; lat. 23° 10' N., long. 38° 42' W. 
Temperature of air at noon, 72°‘8 ; mean for the day, 70° 7. 
Temperature of water : — 
Surface, . 
0 
71-0 
400 fathoms, 
48-0 
10 fathoms, 
71-8 
500 „ 
44-5 
20 
ft • 
71-8 
600 „ 
42-2 
30 
tf • 
71-8 
700 „ 
40-8 
40 
»» 
71-6 
800 „ 
40-0 
50 
ft 
71*4 
900 „ 
39 6 
60 
ft • 
71-2 
1000 „ 
39-2 
70 
ft • 
70-5 
1100 „ 
38-9 
80 
*! 
69-3 
1200 „ 
38-6 
90 
»* 
68-2 
1300 „ 
38-2 
100 
!» 
67-0 
1400 „ 
37-9 
200 
)t • 
58-0 
1500 „ 
37-6 
300 
ft 
52*5 
! Bottom, 
36-5 
Density at 60° F. at surface, 1 ‘02774 ; bottom, 1 ‘02753. 
Depth, 2720 fathoms; deposit, Red Clay, containing 13'30 per cent, of carbonate 
of lime (see Murray and Renard, Deep-Sea Deposits Chall. Exp.). 
At 7.30 a. \f. sounded in 2720 fathoms. Obtained serial temperatures at intervals of 
10 fathoms down to 100 fathoms, thence at intervals of 100 fathoms down to 1500 
fathoms. The carbonic acid was determined in the bottom water, and found to amount 
to 40‘0 milligrammes per litre. 
Distance from Sombrero Island at noon, 1141 miles. Made good 110 miles. Amount 
of current 12 miles, direction S. 69° W. 
Surface Organisms. — Moseley writes : “ Went out in a boat about 1 P.M. ; sun very 
ii t and sea rough. 1 saw one Velella and caught a few Copepods, amongst them a 
(. <!■ ■> u* and one or two Radiolarians, one of which last was a social one like Collosphxra, 
but with m intensely violet coloration of the whole contents of each capsule, except the 
eentnl vesicle. The surface was, however, on the whole very barren; in fact, as oceanic 
min: >i- V nerally tome to the surface usually in calm weather, it is difficult to understand 
wbai t! n habits must be in tin region of the trades. Are there very few in that region ? 
r do tl <• there never come to the surface? or is the fauna different? Three hying 
fi'h were ■'••i i j in the early morning, but they arc very scarce.” 
Wilh •moo* Stih in made drawings of a small Oopcpod (male and female), which he thus 
describes : “It is 0’87 mm. long, and 0’35 mm. broad. The genus to which it belongs 
- 
