SEA-FISHERIES LABORATORY. 215 



November, 1905. The tongue of salter water passing up 

 the Irish Sea seems to be much less pronounced than in 

 1905, and the charts also seem to suggest that in 1904 the 

 Gulf Stream Drift struck the Land's End instead of 

 striking against St. David's Head. This is also rendered 

 more probable by Gough's observations " On the distribu- 

 tion and the migrations of Muggiaea atlantica (Cunning- 

 ham) in the English Channel, the Irish Sea, and oif the 

 South and West Coasts of Ireland in 1904."* 



Only a few isolated hydrographic observations made 

 by the " Helga " in the Irish Sea during 1905 have been 

 published (Bulletins trimestriels). During 1909, however, 

 the " Helga " made a detailed hydrographic survey 

 of the whole Irish Sea with the exception of the portion 

 to the East of the Holyhead-Calf of Man line which we 

 have been investigating from Liverpool since 1906. 

 This hydrographic work was carried out under the 

 direction of Mr. E. W. L. Holt, of the Irish Department 

 of Agriculture, and Mr. Holt has very kindly given me 

 permission to make use of his figures (which will be 

 published in the Bulletins trimestriels for the current 

 year). I have, therefore, introduced Holt's and our own 

 figures for 1909 on the same charts as Matthews' figures 

 for 1905, as no figures for a date later than 1905 are 

 available for the southern area. 



It is evident that the curves drawn for 1909 are not 

 directly comparable with those drawn for 1905, and to 

 make this clear on the charts a narrow uncoloured strip 

 has been left between the two sets of curves. Although 

 this combination of the two sets of curves may be open to 

 criticism, it is useful for our present purpose of discussing 

 the flow of water through the Irish Sea. The figures arid 



* Publication de Circonstance, No. 29, du Conseil permanent 

 international pour V exploration de la Mer. Copenhagen, 1905. 



