82 bulletin: museum of comparative zoology. 



or to salinity, for the bluest water was not the saltest, while the coldest 

 water was neither bluest nor greenest. The plankton may give the 

 necessary clue. 



Color, in % of Yellow in the Forel scale. 



Sta. 



Color 



Sta. 





Sta. 



Color 



Sta. 



Color 



Sta. 



Colo 



2 



20 



13 



27 



21 a 



27 



29 



20 



39 



20 



4 



20 



14 



27 



22 



27 



31 



20 



40 



20 



6 



20 



15 



27 



23 



14 



32 



27 



41 



20 



7 



14 



16 



27 



25 



20 



33 



35 



43 



27 



8 



20 



17 



35 



26 



20 



35 



20 



44 



20 



9 



14 



Orr's I. 



44 



26 a 



20 



36 



20 



45 



20 



10 



20 



19 



20 



27 



20 



37 



35 







11 



20 



21 



27 



28 



20 



38 



20 







The color of the Gulf of Maine agrees fairly well with that of the 

 southern part of the North Sea, with the English Channel, and with 

 the coast water of the Bay of Biscay (Schott, 1902, pi. 36). Up to the 

 present time we have no records of the color of the water along the 

 coast of the United States from Cape Cod south, or for the Gulf of 

 St. Lawrence. 



Transparency. 



Measurements of transparency were taken with the disc (p. 00) 

 at eighteen stations. In the clearest water (Station 23) it was visible 

 at 8.2 fathoms; but it usually disappeared at from four to five fathoms. 

 There was little, if any, correlation between color and transparency 

 at these stations, for though the water was most transparent where 

 bluest (Station 23), it was not least so where greenest, but where the 

 percentage of yellow was only 20% (Station 38). 



Transparency, in fathoms. 



Sta. 



Trans. 



Sta. 



Tr 



4 



3.5 



31 



4 



11 



6 



36 



4 



12b 



6 



37 



4 



14 



6 



38 



3 



15 



4.5 



39 



4 



16 



3.5 



40 



6 



22 



7.2 



41 



5 



23 



8.2 



43 



5 



25 



6.5 



44 



5 



