Dans ce livre, Rapha l Dubois tudie les mollusques qui produisent des perles et la nacre qui en r sulte. Cette tude d taill e offre une compr hension in gal e de ces animaux et de leur production. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within...