Changes to the text have been made only in the case of obvious spelling or type-setting errors. These are listed as follows:
[Page ix]: changed "Phoshorescence" to "Phosphorescence" (II. Luminescence and Incandescence ... Phosphorescence and fluorescence.)
[Page ix]: changed "Biozymoxyluminescence" to "Biozymoöxyluminescence" (V. The Chemistry of Light Production, Part I ... "Biozymoöxyluminescence.")
[Page x]: changed "chemi-luminescence" to "chemiluminescence" in two instances (Reaction velocity and chemiluminescence. Temperature and chemiluminescence.)
[Page 15]: changed "th" to "the" (Less well known is the Ignis fatuus)
[Page 26]: re-positioned period outside of parentheses "after being illuminated (photoluminescence)."
[Page 29]: changed "platino-cyanide" to "platinocyanide" (Fluorescent screens of barium platinocyanide)
[Page 29]: added missing comma (willemite (Zn2SiO4), Sidot blend)
[Page 34]: added missing closing quotation mark ("It is altogether probable that the cause of this" ...)