TEMPERATURES. 



225 



of water between 200 aud 500 fathoms is somewhat colder than 

 in the Windward Passage. This is perhaps due to a similar 

 cause to that which lowers the temperature of the water in the 

 shallower sections of passages between the islands of the eastern 

 edge of the Caribbean. As for instance in the Mona Passage, 



Chianos 'Ct.Cuba 



JOB 



l!?2S. 



where a belt of water exists between 200 and 337 fathoms, colder 

 than in the adjoining deeper passage between Cuba and San 

 Domingo. Similarly the section between Jamaica and the Pedro 

 Bank (Fig. 151) shows a slight diminution of temperature be- 

 tween 300 and 600 fathoms, which we are inclined to refer to 



MoranlPt-Tamalca' 



pSAf7 



Fig. 150. 



Cap Tinuron 



the existence of a ridge to the eastward, over which the colder 

 water of the eastern Caribbean forces its way. 



The section from Jamaica to San Domingo (Fig. 150) shows 

 in the deep channel extending northeast of Jamaica, which con- 

 nects the eastern basin of the Caribbean with the Honduras 

 basin, a larger amount of cold water between 150 fathoms and 



