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TEMPERATURES. 225 
of water between 200 and 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, 
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Weg, Scale 
Fig. 149. 
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 
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San Domingo, 
Fig. 150. 
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 
