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 404° 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, 45i° at 

 300 fathoms, 40° at 600 fathoms, and a bottom temperature of 

 39r at 1,082 fathoms. 



Across the Mona Passage there is but a small passage for cold 



SCmA. Zl\isr9 



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 



fUaLEspada SanOomln^t 



Ibual _ Jt^nvoPttsrlb Hies . 



Fig. 148. 



of 300 fathoms, shows a much higher temperature, the decrease 

 being only 12° for the first 100 fathoms, and 9° for the second 

 100, with 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 



