232 
THE VOYAGE OF H.M.S. CHALLENGER. 
s 
stai v 58 Density at 60 F. at surface, 1 027 14 ; bottom, 1 '02701. 
Depth, 2800 fathoms ; deposit, Blue Mud, containing 25 '02 per cent, of carbonate 
of lime (see Murray and llenard, Deep-Sea Deposits Ckall. Exp.). 
At 10.10 a.m. stopped and sounded in 2800 fathoms. The sudden rise of temperature 
ibout l.:t0 p.m. from 59 '5 to 64 8, and as high as 71°'5, showed that the Gulf Stream had 
gain been entered. At 4 p.m. took a series of temperatures down to 1500 fathoms. A 
heavy swell from the S.W. continued all day long, and prevented any attempt to dredge, 
i >u pacing from the Arctic current to the Gulf Stream current the usuai change of colour 
of the water from an inky green to a deep blue was observed. 
Distance from Bermuda at noon, 456 miles. Made good 95 miles. Amount of 
current 25 miles, direction S. 25° E. 
.sr mi. s 52a. Station 52a, Halifax to Bermuda. 
May 24, 1873 ; lat. 38° 16' N., long. 63° 17' W. 
Temperature of air at noon, 
70°'S ; mean for the day, 70 o, 5. 
Temperature of water : — 
Surface, .... 
73 0 
100 fathoms, . 
65-5 
25 fathoms, 
73-0 
125 „ ... 
64-7 
50 
730 
150 „ ... 
64-5 
75 „ . . . 
67-4 
Continued strong breeze from S.W., accompanied by heavy seas. At 3.45 p.m. 
shortened -ail to obtain serial temperatures at intervals of 25 fathoms down to 150 
fathoms ; also tried current. 
Distance at noon from Bermuda, 382 miles. Made good 73 miles. Amount of 
current 21 miles, direction S. 8° E. 
Station 53 (Sounding 112), Halifax to Bermuda (see Chart 9 and Diagram 2). 
May 26, 1873 ; lat. 3G° 30' N., long. 63° 40' W. 
Temperature of air at noon, 74" *8 ; mean for the day, 7 2°*7. 
Temperature of water : — 
e 5 
Surface, . 
730 
400 fathoms, 
54-5 
25 luthoms, . 
69-5 
500 „ 
45*2 
60 „ 
662 
600 „ 
41-2 
75 ,, . 
64-0 
700 „ 
39-8 
100 „ 
64 0 
800 „ 
39-2 
150 
640 
1250 „ 
37-9 
200 „ 
63-6 
1500 „ 
37-3 
300 „ 
602 
Bottom, 
36-3 
