68 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
being only .2%o; and in the Grand Manan Channel (Station 33) there 
was virtually no difference in salinity at different depths, 7. ¢., we find a 
reproduction of the temperature curve, though at all depths it was 
somewhat fresher than the water over German Bank. 
Salinity at twenty-five fathoms (Plate 2).— We have only a few 
samples at precisely this depth; but the salinity sections, and samples 
taken at several stations a little deeper or a little shallower than 
if 
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Fie. 26.— Salinity sections at Stations 9, 11, 15, 19, 21, from Ipswich Bay to 
Monhegan. 
twenty-five fathoms, afford sufficient data for tentative mapping of the 
_ curves for the various values at this level. It must be remembered, 
however, that it, and the following charts, are not offered as final. 
At twenty-five fathoms the salinity for the whole of Massachusetts 
Bay, and for an area extending eastward some thirty miles over part 
of the deep basin was between 32.5 and 32.6. And comparison with 
the chart of surface salinity (Plate 1) shows that the curve of 32.6 in 
this region reproduces the eastward swing of the curves of 31.8 and 
