8 



dition had prevailed for the past month or six weeks. For four 

 weeks after this date, the water was continually fresh on the 

 surface at the laboratory wharf, one-fourth of a mile in from 

 the jetties. During this period the current in the river was 

 rii.nning down, at least on the surface, almost continually; the 

 intervals when there was any appreciable current running up 

 being restricted to times when there was a strong breeze from 

 the south or southeast. Even during the occurrence of a flood 

 tide this- salinity of the water in the pass seldom became appre- 

 ciably raised, since, on account of the great volume of fresh 

 water carried down during the longer periods of- ebb tide, the 

 vT'er in the Gulf near the mouth of the pass was fresh for a 

 distance of two miles off shore. The salinity of samples' of water 

 t.iken at the sea buoy one and one-half miles from the jetties 

 during ]\T,ay and the first half of June, varied between 1.00 and 

 1.0031, while the line of separation where the fresh muddy water 

 irom the pass met the clear blue water of the Giilf was, opposite 

 the mouth of the pass, from one and one-half to three miles off 

 shore. 



The salinity of the water from several places in the pass 

 was determined at least once a day, usually in the morning, and 

 whenever any unusual condition, such as the occurrence of a 

 marked current running up the river prevailed; a series of de- 

 terminations at the different stations were made supplementing 

 the regular daily observations. The stations where these de- 

 terminations were made were as follows: 1, at the laboratory 

 wharf; water was taken here at the surface and at one foot 

 above the bottom — six to seven feet of water being f ound^ here ; 

 2, over an oyster reef in sixteen to twenty feet of water, near 

 the boat landing of the Calcasieu light house; 3, from the sur- 

 face and near the bottom at a point near the outer end of the 

 east jetty. Beside these stations where the salinity was recorded 

 daily, observations were made on the water over the other reefs 

 in the pass as they were visited from time to time in the course 

 of the work. At times when there was salt water over the reef 

 near the light house, samples of water were taken from over the 

 ot' tr reefs in the lower part of the pass in order to determine 

 how far up the river the flow of salt water ascended. 



