280 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



REPORT ON HYDROGRAPHIC OBSERVATIONS 

 MADE IN THE IRISH SEA DURING 1913, 

 WITH A NOTE ON THE POSITION OF THE 

 ISOTHERMS IN THE NORTH ATLANTIC 

 DURING 1907-1913. 



By Henry Bassett, Jun., D.Sc, 

 Professor of Chemistry, University College, Reading. 



(With three Charts.) 



During the past year hydrographic observations have 

 been made at the 24 Stations, the positions of which are 

 indicated on the chart on page 191. Monthly observa- 

 tions have been made at Stations 1 to 7, which are regarded 

 as the most important, while observations at the remaining 

 Stations have only been made on the " quarterly " cruises 

 in February, May, August, and November. Bottom, 

 intermediate, and surface observations were made at 

 Stations 5, 6, and 7; elsewhere only surface observations 

 were made. The weather during the cruises has been 

 invariably bad, and on one or two occasions several 

 Stations have had to be omitted. 



The salinities at the several Stations during 1913 

 show some noteworthy features. In the first place the 

 water samples obtained from the three deep Stations 

 (5, 6, and 7) have been remarkably similar to those 

 obtained in 1912. Not only were the salinities unusually 

 high at these Stations in both years, but the actual 

 monthly values were, in most cases, nearly identical. 

 The temperatures at these three stations have shown rather 

 greater differences, having been somewhat lower during 

 the summer months of 1913, but otherwise higher than 

 during the corresponding months of 1912. 



When we consider the Stations in the shallower water 

 to the North of the line, Calf of Man-Holyhead, we find a 



