TEMPERATURES. 223 
sage between Dominica and Martinique, the diminution of tem- 
perature between the surface and 100 fathoms ranges from 79° 
to 54°; a temperature of 46° is recorded at a depth of 300 
fathoms, and a bottom temperature of 401° in 591 fathoms. 
In the section of the passage between St. Lucia and St. Vin- 
cent (Fig. 147), we find 56° at a depth of 100 fathoms, 453? at 
300 fathoms, 40° at 600 fathoms, and a bottom temperature of 
395 at 1,082 fathoms. 
Across the Mona Passage there is but a small passage for cold 
E March. 244879. 
n1 v е 2 
a Chi: о Ф Б] ? g © Tarratce Pt. 
bay x7 n а a а C E ай "rm 
Fig. 147. 
water between Direcho Island and Porto Rico. (Fig. 148.) We 
find there at a depth of 454 fathoms a bottom temperature of 
44°, about what we have in the other passages. The larger 
area of this section across this passage, with an average depth 
BolntBepada g 
‘Point. Jignore Puerto Rico. 
5 
a 1 
3 Apr. д7 1879, м ODisechooT, 3 
i P 1 4 dorm 1 
М E 
of 300 fathoms, shows a much higher temperature, the decrease 
being only 12? for the first 100 pen and 9? for the second 
100, Aun a bottom temperature of 51° at 337 fathoms. We 
notice in this section a temperature of 54° at 260 fathoms near 
Direcho Island, while it is 56° at a distance of about fifteen 
