In other words, the intensity of attack diminished from west to 

 east. A study of the figures given in table 2 indicates that the salinity 

 of the hay water also diminishes as one proceeds eastward toward the 

 mouths of the Sacramento and San Joaquin Elvers , Here we see clearly 

 the connection between the rate of intensity of marine borer attack and 

 the salinity of the water. The salinity records for 19k^ through 19k'!, 

 for all three of the test board locations at Port Chicago, disclose a 

 wide range of variation for different times of the year. At no time 

 was the water even half as saline as normal ocean water, and the salinity 

 was generally extremely low during the first half of each year, especially 

 during the summer months when the water is merely brackish, 



2. Llmnor la . The only evidence of Llmnorla a t any of the 

 three locations was a single tunnel found In a test panel at Wharf No, 2 

 and 5 tunnels found in a test panel at Wharf No. 3, Both of these 

 panels had been subniBrged for 9 months and were removed early in June 19h6. 



Al+2,Ol4- Fouling Agents 



1. Silt . ' Silt occurred as traces to moderate or rarely heavy 

 deposits on all the panels of both the control and test series at all 

 three locations, 



2. Algae , Traces of green algae occurred on a single panel of 

 the control series and on one of the test series at Wharves 2 and 5. 



5. Invertebrate animal phyla . 



a, Coelenterata (hydrolds and Metrldlum ). Hydroids occurred 

 on 2U of the 51 control panels and'on 24 of the 25 test panels (5 panels 

 not received) at the Barge Pier. At Wharf No. 2, they occurred on 22 of 

 the 55 control panels and on 52 of the 55 test pemels. At Wharf No, 5* 

 they occurred on 25 of the 55 control panels and on 52 of the 55 test 

 panels. The growths mostly rated from traces to moderate on the panels 

 of the control series and from traces to moderate, or occasionally 

 heavy, on the panels of the test series. Tubularla was Identified on 

 several panels. Three colonies of Metrldlum a member of a different 

 group of Coelenterata, occurred on a single test panel at Wharf No. 2, 



b, Bryozoa (encrusting and filamentous) . Encrusting Bryozoa 

 occurred on a single control panel and on 5 of the 26 test panels at the 

 Barge Pier, on a single control panel and on 5 of the 55 test panels at 

 Wharf No. 2, and on 2 of the 55 control panels and 5 of the 55 test 

 panels at Wharf No, 5, Electra sp, was identified on a few of these 

 panels. Filamentous Bryozoa occuirred on a single test panel at the 

 Barge Pier, 



190 



