3 88 



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 algae 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 algae. 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 i ,000 grms. of water, 

 were as follows: 



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 Fivers Island) since June, 1913. A summary of these 

 is as follows 



It will be observed that the recorded density ranged from i.oio to 1.0258. The 

 general average, obtained by averaging the monthly averages, is 1.0205. I* 1 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 



