SEA-FISHERIES LABORATORY. 291 



North Wales in November, but to bend upwards towards 

 the east side of the Isle of Man in May. The direction 

 of the general drift of water is indicated by straight lines 

 drawn normal to the isothermal curves; hence the main 

 drift of water in November (and in February) appears 

 to be round the coast of Anglesey into the sea off the 

 coasts of North Wales and Liverpool Bay; while in 

 May (and in August) it rather appears to be towards the 

 sea between Isle of Man and Cumberland. At any rate, 

 these appear to be the general directions along which 

 temperature changes are occurring. 



The temperature gradients during this month are 

 steeper than they are in May. That along the line of 

 Hydrographic Stations 1 to 4 is nearly 3° ; between Nelson 

 Buoy and Bahama Bank it is about 1'5°; and between 

 Nelson Buoy and the Red Wharf Bay fishing area it is 

 very much the same. A further important condition 

 may be noted : there are two areas of relatively warm 

 water, (1) just South of Bahama and King William 

 Banks, and (2) just North from Red Wharf Bay and 

 Great Orme's Head. 



Chart III represents the conditions in February, 

 1913 (the other Charts relate to 1912). The course of the 

 isotherms cannot be very precisely indicated for this 

 month since the data for the light vessels and the various 

 coastal stations have not been obtained at the time of 

 writing. It is, however, added here in order to amplify 

 the general argument of the paper. It shows that the 

 conditions represented by the temperature distribution 

 of November still exist, and that the differences and 

 gradients shown in the chart for that month are 

 accentuated in February, when the process of cooling on 

 the one hand, and the progress of the drift from the 

 Channel round into Liverpool Bay are attaining a 



