CHAPTER III.

MANIPULATIONS OF THE COLLODION PROCESS.

Section I.--_Manipulations with moist Collodion._--Cleaning the Plates.--Coating with Collodion.--Exciting.--Exposing.--Developing. --Fixing 213

Section II.--_Simple directions for the use of Photographic Lenses._--Portrait Lenses.--View Lenses.--Mode of finding the chemical Focus 227

Section III.--_On copying Engravings, Etchings, Diagrams, etc._--Mode of intensifying the Collodion 231

Section IV.--_Rules for taking Stereoscopic Photographs._--Mr. Latimer Clark's arrangement for working with a single Camera 232

Section V.--_The Photographic delineation of Microscopic Objects.-_-Arrangement of the apparatus.--Mode of finding the chemical Focus.--Use of artificial light 235