Vlll CONTENTS. 



CHAPTER VI. 



PAGE 



Former Methods adopted in the Arrangement of the Apparatus 90 



Later Methods ....... 92 



The Method adopted in this Work . . . .94 



Dr. Dallinger's Illumination ..... 112 



CHAPTER VII. 



Defects in Negatives ...... 128 



Their Remedy . 129 



CHAPTER VIII. 



Production of Positives ...... 137 



Enlarging ........ 147 



