The Migration of Frshes. 33 
is almost two degrees (1 deg. 8 m.), the figures being 51 
deg. 5 m. for Great Harbor; for Little Harbor, 53 deg. 
3 m. It does not seem assuming too much to place the 
quarter-month average for the first half of May at 50 deg. 
and 51 deg. 4 m.. For November the Great Harbor quarter- 
month means are 51 deg., 51 deg., 51 deg., 47 deg. 7 m., 43 deg. 3. 
The menhaden strike into Vineyard Sound early in May or 
late in April, and linger until November and even December. 
At New London the quarter-monthly averages for the last 
half of April and the first half of May are 49 deg., 48 deg. 
5 m., 52 deg. 5 m., 54 deg. 5 m.; for late October, 55 deg. 2 m., 
54 deg. 9 m.; for November, 53 deg. 5 m., 51 deg: Y my 48 
deg. 1 m., 46 deg.1 m. The fish come on the eastern coast of 
Connecticut late in April, and are frequently taken as late as 
the middle of November. The temperatures of New London 
suggest that there may be something in error in the Woods 
Holl observations, in so far as they are supposed to indicate 
the temperature of the ocean in its vicinity. The periods 
of appearance and disappearance at Waquoit and Menemsha, 
in the Vineyard Sound, agree nearly with those of Eastern 
Connecticut. 
The temperature of the Chesapeake must be studied from 
the observations made at Baltimore and Norfolk. At the 
latter place the April means are 52 deg., 56 deg. 5 m., 61 deg. 
2 m., 60 deg.; the November means are 59 deg., 54 deg. 6 
m., 53 deg. 5 m., 48 deg. 5 m.; at the former for April, 45 deg 
6 m., so deg., 54 deg. 5 m., 55 deg. 7 m.; for November, 54 
deg. 2 m., 52 deg. 1 m., 50 deg., 47 deg. At Norfolk the 
averages for the last half of March are 48 deg. and 50 deg. 
-The movements of the menhaden in more southern waters 
have not been very carefully observed, but we know that they 
enter the Potomac late in March and early in April, and 
