388 BULLETIN OF THE BUREAU OF FISHERIES. 
from the laboratory were not successful, since the necessary changes of the photometer 
could not be made out of doors. These figures probably represent about an average 
of the conditions occurring through the greater part of the harbor. At certain places, 
especially near the inlet where the alge are more abundant, the water is somewhat 
clearer. 
SALT CONTENT OF WATER. 
Determinations of the salt content of the water from five places in Beaufort 
Harbor were made by Wheeler (1910) in the summer of 1909 during the progress of 
the present study of the alge. The water was obtained from (A) Beaufort Inlet; 
(B) the laboratory wharf; (C) Bogue Sound opposite Moorehead City; (D) between 
the eastern end of Beaufort and Bird Island Shoal; (E) Green Rock in Newport River 
near the entrance to Core Creek. The results, stated in parts per 1,000 grms. of water, 
were as follows: 
A. B. (Ge D. E. 
28.043 27-836 27-977 28.006 24-796 
842 +742 +751 +751 = 702 
3-379 3-245 3-300 3-335 2.978 
2-417 2.328 2.320 2-372 2.062 
I. 171 1.168 1.202 1.188 1-039 
-220 +214 +214 +215 +215 
Wotal peeves te sets pigeie eth. thee ore SO Sete a OR Ce 36.072 35-533 35-764 35-867 31. 786 
Specific gravity at 28.7°C.............. Be ope erica done rise 1.0227 I-0222 1.0226 1.0227 T- 0193 
As is shown, both the total salt content and the relative amounts of the different 
salts vary in different places and at different times, the total ranging, in these analyses, 
from 3.1786 per cent to 3.6072 per cent. 
The density, of course, varies at different times, being largely determined by the 
amount of rain and the state of the tide. At times, after continued hard rains, the 
water in the harbor has, for days, the color of weak, muddy coffee, due to water coming 
from the inland juniper swamps. Daily salinometer readings have been made at 5 
p. m. at the laboratory wharf (on Pivers Island) since June, 1913. A summary of these 
is as follows: 
Maximum.| Minimum. | Average. Maximum.| Minimum, | Averege. 
Jirme wa este ac ceetonsiet 1.0228 1.0184 I. 0209 1.0248 1. 0186 I- 0212 
Te ie ak a Oe 1.0238 1.0216 1.0228 1.022 1-010 I-O179 
AMGgHSES . FLAC. BE 1-0226 1.020 I. O21 1.0204 I. O1r2 I- 0173 
September.......... 1.0204 t.0132 1.0168 1.0213 1-015 I- 0183 
ctoher7s th SAGs 1.0236 I. O17 I. 0199 1.0234 I.019 I-0212 
November........... Ae I.024 I. 0102 I.0209 1.0258 I.021 1.0234 
December’, AGLI ase 1.0256 I. 0192 1.0226 1.0246 1.022 I-023 
It will be observed that the recorded density ranged from 1:o10 to 1.0258. The 
general average, obtained by averaging the monthly averages, is 1.0205. In these 
figures no account is taken of the temperature, since in such salinometer records the 
errors of reading are almost certainly greater than the temperature corrections. For 
the same reason the maxima and minima are not accurate, but probably cover the 
