222 THREE CRUISES OF TIIE “ BLAKE.” 
within the ridges separating it from the Atlantic, the deepest 
soundings, such as those off Bequia, 1,591 fathoms, and off Mar- 
tinique, 1,224 fathoms, indicate a bottom temperature of 392°. 
From St. Thomas to Ham’s Bluff (Santa Cruz), on the con- 
trary, the temperature section seems to indicate that the deep 
water there (2,376 fathoms, with a bottom temperature of 
384°) is connected by a deep channel extending between Som- 
brero and Virgin Gorda with the cold A water. The 
temperatures in the section across the passage between Domi- 
i 
р.а Diable 
PLRosalio 
Martinique 
Dominica 
p 
niea and Martinique (Fig. 145) show an extraordinary fall 
between 50 and 150 fathoms, — from 71° to 55^; then a much 
colder layer between 150 and 300 fathoms, "i a bottom tem- 
perature of 421^ at a depth of only 430 fathoms. The bottom 
Ё „Marth 23 1879 B 
KI © n" a эп 
Balines Pt. EUER * $ R вот PtHardy 
M sph mmn аат Ci тэ” 191—5o*- .-.— ле 
ILLI атта Ty 
ао әв = 
REED Ai. m 
«00 | \ wji. a) 
i 1 
3. зоо \ 6° if 
mR \ E 
He "albas a 
Fy Cu 
B воо а ИЯ 
Г а v4 
Bl Lone retten 
Fig. 146. 
temperature in the northern part of the passage was 41° at a 
depth of 575 fathoms. 
In a section from Martinique to St. Lucia (Fig. 146), with a 
somewhat larger area than that of the southern part of the pas- 
bottom temperature of 3919. The * Al- perature of 394° at the greatest depth 
batross" also ran a line across the east- recorded, — over 2,600 fathoms. 
ern Caribbean, and found a bottom tem- 
