192 



Morphology of the Digesti\'e Tract of Teredo navalis, by E. L. Lazier. Univ. 



CaHf. Publ. Zool., _'_', 455-474. 

 The Boring Mechanism of Teredo, by R. C Miller. Univ. Calif. Publ. Zool., 26, 



41-80. 

 Wood-boring Mollusks from the Hawaiian, Samoan and Philippine Islands, by 



R. C. Miller. Univ. Calif. Publ. Zool., 26, 145-158. 

 Wood-boring Crustacea from Hawaii and Samoa, by R. C. Miller. I'niv. Calif. 



Publ. Zool., 26, 159-164. 

 Ecological Relations of Marine Wood-boring Organisms in San F"rancisco Bay, 



by R. C. Miller. Ecology, 7, 247-254. 

 The Salt Error of Cresol Red, by W. D. Ramage and R. C. Miller. Jour. Am. 



Chem. Soc, 47, 1230 (1925). 



In preparing the present account the freest use has been made of the contents 

 of these earlier papers. Space does not permit, however, a full inclusion of all matters 

 that have been discussed in them. The attempt has been made to set forth in the 

 following pages the more salient results of the biological work, particularly from the 

 standpoint of their bearing on engineering problems. Biologists and others desiring 

 a fuller account of certain items as matters of scientific interest will from time to 

 time be referred to the papers wherein these are discussed in greater detail. 



ACKNOWLEDGMENTS 



It is difficult, indeed impossible, to acknowledge adecjuately the assistance given 

 and the courtesies extended to the several members of the biological staff during the 

 progress of this in\estigation. Hardly a week has passed since the inception of the 

 work in which some signal courtesy has not been offered. Transportation by land 

 and water has been freely made available, labor and often materials have been pro- 

 vided, and routine details of placing and removing test boards and taking water 

 samples have been handled over long periods of time without charge. This assistance 

 has been indispensable to the successful prosecution ol the work. 



Special mention should be made of a number of organizations which have con- 

 tributed such assistance in unusual degree. The success of the test board program 

 was due primarily to the cooperation of the U. S. Lighthouse Service. Test boards 

 were installed at the principal Light Stations in San Francisco Bay, and the trouble- 

 some routine of installing a new board each month and removing blocks from the old 

 boards was handled with commendable regularity over a period of nearly three years 

 by the lighthouse keepers. Similar cooperation was given at Mare Island and in San 

 Diego Bay by the Public Works Department of the U. S. Navy, and at the latter 

 locality and also in Los Angeles Harbor by the U. S. Army Engineers. Various private 

 corporations have also assisted in the test board program from time to time. 



Most of the salinity records have been furnished by the Southern Pacific Company. 

 Water samples were taken at regular intervals at a number of localities by employes 

 of the company, and the salinity determinations were made in the laboratory of the 

 Southern Pacific Creosote Plant at West Oakland. Also, daily salinity and ti^mpera- 

 ture records have been furnished by the California & Hawaiian Sugar Refining Cor- 

 poration at Crockett and salinities have been taken at frequent intervals at Avon 

 by the Associated Oil Company, and at Martinez by the Shell Company. 



Through the courtesy of the Southern Pacific Company a marine laboratory 

 equipped with running fresh and salt water and aquaria for biological work has been 

 maintained for three years on the Southern Pacific Oakland Mole. A similar labora- 



