THE CRUISES OF THE ‘ PORCUPINE,’ 191 
CHAP. I1V.] 
ture, there being no further diminution to the bottom. 
This serial sounding and all the subsequent tempera- 
ture observations taken during the Mediterranean 
cruise showed that the trough of the Mediterranean 
from the depth of 100 fathoms downwards is filled 
with a mass of water at almost exactly the same 
temperature throughout, a temperature a little above 
or below 12°-75 C. 
The following instances have been cited by Dr. 
Carpenter from the earlier observations in the Medi- 
terranean basin, to show the great uniformity of the 
bottom temperature for all depths :— 
Number | Depth Bottom Surface 
of in Tempera- Tempera- Position. 
Station. |Fathoms. ture. ture. 
ai | 730 | 13°40. | 23°-6C. | Lat 35°57’ N. |Long.4° 12’ w. | 
mee | #90 )13-2 | 23-2 | 35 45 Ny 
| 43 LOZ laa 23 °8 do 24 3 54 307 | 
44 455 | 13-0 Oe s| 35 42 20” 3 00 30” 
45 207 | 12-4 22 °6 39 20 LOM 2 29 30’ | 
46 om ae) 23 -0 35 29 | 1 56 | 
47 | 845 | 12-6 | 21-0 37 25 30” 1 10 30”| 
At this last Station (No. 47) a serial sounding was 
taken, which entirely confirmed the results of the 
first (No. 40) :— 
Surface . 
10 fathoms 
20Gs ae 
30 
40 
50), 
100 
845 
oo 
—o oD 
> or 
Ces 
— HS et 
bo bo Go 
S 
eo] 
=~ 
arm wm > re 
lap) 
