974 
THE VOYAGE OF H.M.S. CHALLENGER. 
Station 251. 
OliGANt!OI.*l FROM 
THE DerotiiT. 
Temperature of water : — 
Surface, . 
650 
400 fathoms, . 
40-0 
25 fathoms, . 
58-2 
500 „ 
38-5 
50 „ . . 
55-2 
600 „ 
37-6 
75 „ 
53-5 
700 „ 
37-0 
100 
52-5 
800 „ 
36-8 
125 
51-5 
900 „ 
36-6 
150 „ 
50-5 
1000 
36-3 
175 
49-4 
1100 „ 
36-1 
200 
48-2 
1200 „ 
35-9 
225 
46-9 
1300 
35-6 
250 „ 
45-4 
1400 
35-3 
275 
43-7 
1500 „ 
35-1 
300 
42-8 
Bottom, 
35-1 
Density at 60° F. ; — 
Surface, 
. 1-02522 
2350 fathoms, 
. 1-02544 
50 fathoms, 
100 „ 
. 1-02528 
. 1-02536 
Bottom, 
. 1-02572 
Depth, 2950 fathoms ; deposit, Red Clay, containing no 
Murray and Renard, Deep-Sea Deposits Chall. Exp.).. 
carbonate of lime (see 
At 1.15 P.M. shortened and furled sails. 
At 1.30 P.M. proceeded under steam, and 
2 P.M. sounded in 2950 
fathoms. At 4 p.m. took serial temperatures down to 
at 
1500 fathom.s. 
The carbonic acid was determined in three samples of water from the 
.surface, and amounted respectively to 29'1, 27'4, and 27 '3 milligrammes per litre. At 
5 P.M. completed temperatures, and at 5.15 p.m. made all plain sail. Albatrosses were 
numerous about the ship, and several were caught, one measuring seven feet three inches 
from tip to tip of the wings, and weighing 8lbs. ; stormy petrels and Mother Carey’s 
chickens were also seen. 
Honolulu distant at noon, 1020 miles. Made good 149 miles. Amount of current 
5 miles, direction W. 
Diato.macea:. — The following species of Diatoms were observed by Mr. Comber in the 
deposit from this Station : — 
C'ttcinodiactu mLlincaluM, Grunow. 
,, Ipjitopw, .lanisch. 
,, ezrerUriniJi, Ehrenbcrg. 
„ „ var. minor, Rattray. 
„ nirvatuluM, Grunow. 
„ mjmholophorw, Grunow. 
„ mihtUis, Ehronlicrg. 
„ marginatwi, Ehrenbcrg. 
„ radiatiu, lllircnbcrg. 
Crminodiscus rentredis, Ehrenbcrg. 
„ rxmvexus, A. Schmidt. 
„ horealis, Railey. 
„ concinnus, Smith. 
„ flp. (?). 
Kthnu/fliftcus sp. (?). 
flemidier.tM cuneifonnis, Wallich. 
Caynjojloflixcue codatus, W. Smith. 
