<00 
THE VOYAGE OF II.M.S. CHALLENGER. 
M 4 TI..S 306 . obtniiu-tl ou the first visit two months previously, including many varieties of Diatoms, 
Xoclihca (much smiJlcr'llim. at Hong Kong, and of a delicate rose tint), Ceratimn 
(/VnViiiiiim) Iriimt (very seldom in catena) and another species, and a number of 
Infusoria, tfcf. 
^^Anoll i07 
Station 207 (Sounding 343), Manila to Samboangtin (see Chart 31 and Diagram 14). 
Jojiuury 16, 1875 ; lat. 12° 2C N., long. 122. 15 E. 
Tcnipi.“rature of air at noon, 80 ‘8 ; mean for the day, 79 5. 
Tenij)oniture of water : — 
Surface, 
fathoms, 
50 
70 
100 
125 
150 
M 
tl 
»» 
If 
175 
200 
II 
If 
sd-0 
225 fathoms. 
77-2 
250 „ 
72-5 
275 
620 
375 
58-5 
475 
.56-0 
575 „ 
54-1 
675 ,, 
531 
52-4 
Bottom, 
51-9 
51-7 
51-6 
51-6 
51-6 
51-6 
51-6 
51-6 
Density at 60° F. ; — 
Surface, . 
50 fathoms, . 
100 
. 102515 
. 1 02536 
. 102546 
200 fathoms. 
Bottom, 
. 102549 
. 102557 
Depth, 700 fathoms; deposit. Blue Mud, containing 3‘22 per cent, of carbonate of 
lime (sec ^Murray and Renard, Deep-Sea Deposits Chall. Exp.). 
At 6 A.M. passed lictween Maestro de Campo and Banton Islands, steamed south of 
Simara Island, and aljout 10 a.m. entered the strait between Tablas and Romblon 
Inlands. At 1.50 r.M. stopped and sounded in 700fathom.s. At 2 p.m. sent down trawl. 
< Ibtained fe rial temj»eratures down to the bottom. The carbonic acid was determined 
111 surface water, and amounted to 37’2 milligrammes per litre. At 5.45 p.m. trawl 
ramc up with wveml sjiecimcns. Bosition of sounding and trawling about four 
miJca south of the sounding of 705 fathoms (Station 204) obtained on November 2, 
1871. on the way north. .\t 6 p.m. made all plain sail. 
The following s|»ecics are recorded in the Zoological Reports from the trawl at 
this Station : — 
