CONTENTS 9 



Chapter Page 



XVII The Particular Kind of "Crippled" Shell 



that Yields the Pearl 155 



The Influence of Local Conditions upon the 



Color of Shells and Pearls 165 



v XIX The Luster of the Pearl Its Cause Ex- 

 plained 173 



-- XX The Care, Value and Sale of Pearls 178 



XXI Imperfect Pearls and How to Improve 



Them 190 



XXII Imitations and Tests for Detecting Them.. 194 



XXIII An Interesting Exhibit of Pearls 201 



