. Juvenile Instructor. Figures. Shell of tbe little bird moUusk yAuidua). nacre or pearl. This substance is asecretion of the animals body andenables it to keep the inside of its shellsmooth. If any irritating particle, suchas a tiny bit of stone, or a grain of sandbe carried into the shell, it is sooncovered with many layers of structures are the true pearls of. Figure 10. shell of pcurl oyster ( coiitiilnliif; olijoets eovcn^d with peurl. 438 THE JUVENILE INSTRUCTOR. commerce, which rank among the mostcostly of jewels. It is possible toincrease the supply of pearls by
. Juvenile Instructor. Figures. Shell of tbe little bird moUusk yAuidua). nacre or pearl. This substance is asecretion of the animals body andenables it to keep the inside of its shellsmooth. If any irritating particle, suchas a tiny bit of stone, or a grain of sandbe carried into the shell, it is sooncovered with many layers of structures are the true pearls of. Figure 10. shell of pcurl oyster ( coiitiilnliif; olijoets eovcn^d with peurl. 438 THE JUVENILE INSTRUCTOR. commerce, which rank among the mostcostly of jewels. It is possible toincrease the supply of pearls by a semi-artificial process which has been fol-lowed by the Chinese and other orientalnations for centuries. They take the
Size: 1803px × 1386px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorgeorgequaylecannon182, bookcentury1800, bookdecade1890
