166 TRANSACTIONS LIVERPOOL: BIOLOGICAL SOCIETY. 
Observations at Stations I to VII will be continued, 
and new ones started at three or four stations on lines con- 
necting Piel Gas Buoy and Maughold Head and Calf of Man 
and the North West Light Ship. These new lines will be 
started, as it is desirable to have more information about 
the salinity of the areas of water they cross. The obser- 
vations will be made every six weeks instead of every three 
months, so that the times of minimum and maximum 
salinity may be determined more exactly. 
Determinations of salinity, except in special cases, 
will only be made on the surface and bottom water, and at 
the shallower stations only on the surface water, since 
the fact that the salinity m the Irish Sea is practically 
uniform from top to bottom makes further determinations * 
unnecessary. ‘Temperatures at intermediate depths will, 
however, be taken. 
DESCRIPTION OF PuATE II. 
Approximate positions of isohalines in the Irish Sea in 
June, 1906-8. 
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