when dealing with most motions. Further, it has been pointed out, that synchronism 

 loses its danger when occurring at low values of A*. Due acknowledgement to Prof. 

 E. Lewis' achievements has been paid in the text and some hints have been given as 

 to how to extend the pertinent analysis. A numerical investigation of conditions on 

 arbitrary courses appears to be urgent especially in the case of supercritical running. 



My earlier reserve with respect to the solution of the irregular seaway referred 

 to the formal representation only. Some doubts still persist as to the final character of 

 the Pierson-Neumann approach. 



Professor Korvin-Kroukovsky points out quite justly that the word "analogy" 

 is applicable to one part only of his research on the behavior of surface vessels — the 

 investigation on exciting forces. His investigation on coupling terms is farther reaching. 

 It is to be expected that further work in this direction will go beyond Haskind's bold 

 attempts which by no means have so far led to final conclusions. 



107 



