methods for this work, since the effect of a single bubble 

 or a small quantity of plankton then can be determined. 



2. Raise pure cultures of living plankton in the laboratory 

 to ascertain the effect of living plankton and dead organic 

 matter separately. 



ADMINISTRATIVE INFORMATION 



Work was begun under SR 004 03 01 (NEL L4-1) and 

 S-F011 02 09 (NEL LI -7) and completed under the new 

 problem designation SR 004 03 01, task 0580 (NEL L4-4). 

 The manuscript was completed in January 1962 and sub- 

 mitted to the Graduate School of the Agricultural and 

 Mechanical College of Texas in partial fulfillment of the 

 requirements for the degree of Doctor of Philosophy. This 

 report is a slightly modified version of the doctoral dis- 

 sertation. It covers work from March 1959 to November 

 1961 and was approved for publication 4 September 1962. 



The author is especially indebted to: 



Dr. G. H. Curl for the discussions and advice during 

 the period of the investigation, and his reading and criti- 

 cism of the manuscript. 



Dr. E. C. LaFond for his interest and support during 

 the measurement phase and his assistance in the procure- 

 ment of necessary equipment and facilities. 



Dr. E. G. Barham for his assistance with the phases 

 of marine biology involved. 



Professor R. O. Reid, my committee chairman, for 

 his help and advice with the theoretical parts, as well as 

 help and guidance with the editing of the dissertation. 



Mr. S. A. Burnett for his interested and skillful help 

 in changing ideas into hardware during the development of 

 the cavities and transducers utilized in the project. 



