398 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
The one station (18) made off Boon Island near the end of April 
(April 25, fig. 5) is especially interesting because the water proved to 
be considerably salter (surface 31.76% , 15 fathoms, 32.46% ; 30 
fathoms, 32.65% ) at the surface, and down to about 15 fathoms than 
the Isles of Shoals stations the day before or the day after, though 
below 15 fathoms its curve agrees almost exactly with the latter. 
0 a Mik a) 
ae POE bop fee | ea tee 
gt PP de ie hel [oi Ps eel 
Fic. 7.— Surface temperature and surface salinity, -------- , hear 
Boon Island, April 1-14, and near the Isles of Shoals, April 16—May 16 
And inasmuch as there is no reason to assume any upwelling, the 
weather having been calm for the two preceding days, it is safe to 
conclude that the surface water was normally salter a few miles north 
of Boon Island than it was near the Isles of Shoals. 
The Wood Island ground was visited April 9, 10, and 14. On the 
9th, the temperature was practically equalized at 39° from surface to 
bottom, just as it had been off Boon Island four days earlier; and by 
