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. Color 
2 20 13 27 Zim ie 29 20 39 20 
4 20 14 27 22 rad 31 20 40 20 
6 20 15 27 23 14 oe Zk 41 20 
7 14 16 27 20 20) Bo: ane 43 yo 
Ss 20 17 35 26 20 35 20 44 20 
9° 14 Orr’sI. 44 yall 36 20 45 20 
10 =. 20 ACR ae ge | nis y Ge | 
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, pl. 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 dise (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. Trans. 
| 3.9 ot 4 
1] 6 36 4 
12b = 66 37 4 
14 6 38 3 
15 4.5 39 4 
16 aro 40 6 
22 1.2 4] 5 
23 8.2 43 5 
25 6.5 44 5 
