TEMPERATURES. 235 
of Yucatan and the Windward Passage. Nothing but actual 
observation has developed the fact that in the Straits of Bemini 
this current extends across the whole width of the straits and 
to the very bottom.’ In the Windward Passage the dredgings 
Distances trom the Coast in Nautical Miles. 
Ir БЕП] ads Y 
fis E 
m & ки n т — Posijion. 
oe . 
д е н ШЇ 1 
A leal ie alia gui Bi 
М ү 
= N оо 
wera! g lo Nes 
200 
Зоо Д a =ч, Зоо 
A 
T EN 
400 pt ES \ n 7 „00 
| А at NL N nog 
П 
боо F. i -+- —ф——[6оо 
Position кы nen XIX ХХХ ХХХІ XXXI XXXI Position. 
Fig. 163.—Off St. Simon’s Island, Ga. 
made on the dividing ridge and on each side of it indicate, from 
the presence of a large amount of pteropod silt on the southern 
1 Henry Mitchell looks upon the Nich- in which the decline of temperature with 
olas and Santaren Channels, as well as the depth is a little more rapid than in 
the Providence and Exuma, not as chan- the track of the Gulf Stream. Mitchell 
nels proper worn by currents, but as por- also considers that the current of the Gulf 
tions of the ocean bed left undisturbed in Stream has had no share in cutting out 
the upheaval of the Bahamas. These the Straits of Florida. 
channels are motionless masses of water, 
