243 
1906-7.] The Electric Conductivity of Sea-Water. 
physical properties are not always exact measures of the chlorine in the 
sea- waters, but that the difference between the value fur chlorine calculated 
from the physical constants, and that measured by titration, is sometimes so 
small, that for purposes of oceanography it may be assumed that the two 
values are identical. 
Daubeny Laboratory, 
Magdalen College, Oxford. 
(. Issued separately September 11 , 1907 .) 
