10 



COMMITTEE EQUIPMENT 



Through the courtes>' of the Southern Pacific Company, the Committee was 

 able to estabHsh a biological field laboratory and experiment station on that company's 

 freight pier adjacent to the Oakland Mole. Here, with running water both fresh and 

 salt, marine borers were maintained in continuous health and activity, as well as 

 subjected to varying salinities down to perfectly fresh water. This work permitted 

 a most valuable control check upon the field work in respect to the critical factors 

 operative in the survival and extension of teredo. Here also were tested the toxicity 

 upon marine borers of various creosote constituents and other chemicals. Reached 

 by ladder below the field laboratory was a working platform at the approximate level 

 of high tide, from which experiments under actual tide conditions were conducted. 



Fig. 3. Test station A at Oalvland Mole, showing the high tide level platform underneath the 

 wharf, with several test gates pulled up for inspection. 



This platform and the surrounding piling was also used by the Sub-Committee on 

 Protections for the exposure to borer attack of the various piling protections which 

 it tested. 



Through the similar courtesy of the California & Hawaiian Sugar Refining Com- 

 pany, the Committee was later supplied with a second biological field laboratory at 

 Crockett, Calif., just at the critical tension point of teredo's survival in Carquinez 

 Strait during the preceding season (as discussed in the biological section of this report). 

 At this laboratory during several months of 1922, a second biologist in the employ 

 of the Committee carried on special investigations under Professor Kofoid's direction 

 with reference to the factors determining this survival. Here also the Committee 

 installed a recording thermometer for the study of the temperature factor. 



In addition to the field laboratories, through the cordial cooperation of the Uni- 



