INDEX. 



IX 



Wet Collodion, Iron Developer 148 

 Wet Collodion, Pyro-developer 147 



Wet Collodion for Slides 144 



Wet Collodion Process 146 



Wet Collodion Slides, To Tone 149 

 White, T. Charters, his Work.. 15 



Window for Dark-Room 55 



Witt, Otto N., Diatom Photos. 14 

 Wood-Section, Easy Object. .. 79 

 Woodward, Dr., his Work.... 13 



.PAGE 



Woodward's Camera Described 40 



' Working Distance " 30 



Yellow Ground on Daitom 



Mounts 110 



Zeiss, Apalantic Magnifier 53 



Zeiss, Dr. R., Photos of Dia- 

 toms 14 



Zirconium Oxide to Replace 



Lime 45 



Description of Plates after Contents. 

 FRONTISPIECE 



PAGE 



Plate I Facing 46 



PI ate II Facing 79 



Plate III Facing 104 



Plate IV Facing 118 



Plate V Facing 136 



Plate VI Facing 152 



