CHAP. IV.J 



THE CRUISES OF THE ' PORCUPINE: 



191 



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 : 



At this last Station (No. 47) a serial sounding was 

 taken, which entirely confirmed the results of the 

 first (No. 40) : 



