REPLY TO DISCUSSION 665 



Paul Lieber 

 IV. Comparative Study of Hydrodynamical Variational Principles, 



Based on the Principle of Maximum Uniformity 673 



Paul Lieber, University of California, Berkeley, 

 California ; 



V. General Symmetry Properties of Flows add Some 



Consequences 681 



Paul Lieber, University of California, Berkeley, 

 California and Kirit Yajnik, Indian Institute of Technology, 

 Kanpur, India 

 VI. Convective Instability of a Horizontal Layer of Fluid with ■ ""i 



Maintained Concentration of Diffusive Substance and 



Temperature at the Boundaries 693 



Paul Lieber, University of California, Berkeley, California 

 and Lionel Rintel, William and Mary College, Williams- 

 burg, Virginia 



A CONTRIBUTION TO THE THEORY OF TURBULENT FLOW 



BETWEEN PARALLEL PLATES 705 



A. S. Iberall, General Technical Services, Inc., Upper Darby, 

 Pennsylvania • - .'. 



DISCUSSION 748 



K. Wieghardt, Institut fur Schiffbau der Universitat 

 Hamburg, Hamburg, Germany 



REPLY TO DISCUSSION 748 



A. S. Iberall 



NUMERICAL EXPERIMENTS ON CONVECTIVE FLOWS IN 



GEOPHYSICAL FLUID SYSTEMS 753 



Steve A. Piacsek, University of Notre Dame, Notre Dame, Indiana 



DISCUSSION 784 



A. S. Iberall, General Technical Services, Inc., Upper 

 Darby, Pennsylvania 



REPLY TO DISCUSSION 784 



Steve A. Piacsek 



SOME PROGRESS IN TURBULENCE THEORY 785 



Robert H. Kraichnan, Dublin, New Hampshire 



STRIP THEORY AND POWER SPECTRAL DENSITY FUNCTION 



APPLICATION TO THE STUDY OF SHIP GEOMETRY AND WEIGHT 



DISTRIBUTION INFLUENCE ON WAVE BENDING MOMENT 815 



Sergio Marsich, Genoa University, Genoa, Italy and Franco 

 Merega, Registro Italiano Navale, Genoa, Italy 



DISCUSSION 881 



G. Aertssen, University of Ghent, Ghent, Belgium 



DISCUSSION 881 



H. Volpich, Brown Bros. & Co., Ltd. Edinburg, Scotland 



REPLY TO DISCUSSION 882 



S. Marsich and F. Merega 



UNCONVENTIONAL PROPULSION 



PROSPECTS FOR UNCONVENTIONAL MARINE PROPULSION 



DEVICES 885 



A. Silverleaf, National Physical Laboratory, Teddington, England 



Vll 



