EXPLORATIONS, WESTERN ATLANTIC, STEAMER BACHE, 1914. 11 
Between 200 and 800 meters, and again below 1,200 meters, the 
ereatest difference is only 0.6°, hardly more than the probable error 
of the curves from which the table is constructed. Above 200 meters 
the Challenger series is decidedly the warmer; but this difference is 
probably due to the geographic location of the stations, the tempera- 
ture of 1914 (fig. 1) suggesting that in that year also the surface 
reading would have been above 21° at the locality of the Challenger 
station. Between the 800 and the 1,200 meter levels the tempera- 
tures were from 0.6° to 1.5° lower in 1873 than in 1914; but here again 
Temperature, Centigrade 
Meter 0 $9.4 & 6 7 8.9 10°11 12.13 14 15°16 17 18 19 20° 21 22 
100 
HSaamess 
COPE 
05 HE Rolie ee Le 
“ok, AF 
Fig. 5.—Temperature sections between Bermuda and the Bahama bank; stations 10185, 10187, 10191. 
it may be the difference in geographic location which is responsible, 
the lower temperature of the Challenger station at this depth being an 
indication of the general and well-known upwelling of abyssal water 
toward the Equator. Indirect evidence to this effect is afforded by 
the fact that these Challenger temperatures agree almost exactly, 
below 800 meters, with Bache station 10212 on nearly the same 
latitude north of the Bahama Bank, and they do not differ from the 
latter by more than 1.4° at any depth, as illustrated in the preceding 
table (p. 10). 
