74 American Fisheries Society 



work has already been done along these lines, its commercial 

 applicability must be reserved for the results of present and 

 later experiments, but I believe that a similar method may 

 be further used on the Unionidse, and possibly applied to 

 certain species of the marine Margariti ferae. 



"It might be of interest in passing to note that, after dili- 

 gent search and inquiry, I have been unable to find any fur- 

 ther records of forced free pearl production with the excep- 

 tion of a record of the late Professor Nishikawa's an- 

 nouncement that he could force the production of free 

 pearls, together with Professor Dean's announcement that 

 he had heard of a demonstration given in Japan by Profes- 

 sor Nishikawa, in which he had certain pearl oysters opened, 

 having predicted that a pearl would be found and that the 

 pearl was found. But apparently no free pearls of forced 

 production have ever come to this country from Japan. 



"It would seem, therefore, that the present is as complete 

 a demonstration as has ever been given and apparently the 

 only one outside of Japan. 



"It only remains then to express my hearty appreciation 

 of the help and interest so many have shown." 



