LIST OF ILLUSTRATIONS n 



The Marchioness of Londonderry 98 



View of Illinois River, showing method of locating mussel 



beds 105 



"Crowfoot" Dredge Outfits 109 



The "Mule" Ill 



"Crow-foot" hook 112 



Hooks and Lines 113 



Outline Shape of "Crow-foot" 114 



Machine for Making Twisted Hooks .116 



The "Crow-foot" Dredge Outfit in Use 127 



The Dip Net 131 



The Dip Net in Use 135 



Shell Tongs 139 



Shell Fork 141 



Eagle Claw Clam Rake 143 



Vat and Table for "Cooking Out" and Sorting Shells 149 



Exterior View of the Worthless "Cripple" 156 



Exterior View of the Valuable "Cripple" 157 



Interior View of the Worthless "Cripple" 158 



Interior View of the Valuable "Cripple," which Yields the 



Pearl 159 



Plate I. Typical Pearl Shapes, Natural Size 168 and 169 



The Countess of Stradbroke 175 



Cross Section View of Pearl and Onion 177 



The Marchioness of Lansdowne 180 



Various Forms of Pearls 183 



Plate II. Typical Pearl Shapes, Natural Size 184 and 185 



Some Average Run Slugs 187 



Japanese Culture Pearl Attached to Shell 195 



