

SEA-FISHERIES LABORATORY. 



129 



object of the present investigation. And it is obvious that 

 we must know all the principal causes of variation of sea- 

 temperature before we can, with confidence, say that the 

 difference between one year and another is due to, say, a greater 

 or lesser influx of Atlantic water into the area in question. 



A series of readings of daily sea-temperature at certain 

 light vessels in the Irish Sea have been given to us by the 

 Meteorological Office : at present we deal with the period 

 1907-12, 1914. The temperatures for January, 1915, are also 

 considered, after which month the records cease for the rest of 

 the war period. Chiefly, three light vessels are in question : — 



Morecambe Bay : Lat. 53° 54' N. ; Long. 3° 31' W. 



Bahama Bank : Lat. 54° 20' N. ; Long. 4° 13' W. 



Carnarvon Bay : Lat. 53° 06' N. ; Long. 4° 49' W. 



Fig. 2. Lightships and hydrographic stations. 



