I. What constitutes photographic optics -- Nature and properties of light -- II. Photographic definiion, real and ideal - form of single and achromatic lenses -- III. The cause of an inverted image. -- IV. Spherical aberration -- V. The nature and function of the diaphragm or slop -- VI Properties of deep meniscus lenses-dompensating single lenses -- VIII. The optical or focal centre of a combination -- IX. Single achromatic lenses -- XXV. Equalising the illumination of subjectsskies and foregrounds -- XXVI. Adjusting dissimilar lenses by light -- XXVIII. How to ascertain the angle of view included by any lens -- XXIX. Refined focussing by means of a telescope -- XXX. Lenses of jena glass -- XXXI. Mounts and cells -- XXXII. Lens grinding -- XXXIII. Optical contact -- cemneting lenses -- XXXIV. Selection of lenses -- XXXV. On the cure of existing distortion -- XXXVI. Latern optics -- Enlarging and projecting -- XXVII. Photo-telescopic lenses -- XXXVIII. Exceptional rapidity with high definition -- XXXIX. Miscellaneous

1. Photometry