p. 100: approprate changed to appropriate (... to a more appropriate evaluation ...). p. 108: meassure changed to measure (By the application of the unit measure ...). p. 184: correspondng changed to corresponding (... signifies a corresponding economy ...). p. 191: A single period deleted from index. P. 188, 189: limit-case changed to limit case (2 occurrences), to mirror text (3 occurrences). Alphabetical sequencing adjusted in index: P. 189: Two 'Energy' entries moved after Energetic mechanics. P. 191: Photographic objective moved below Photochemical processes. P. 191: Physics: The order of the sub-entries swapped. P. 192: Pure science moved down four places to end of "P" entries. P. 193: Two 'Teleological' entries moved after Telegraph, optical. End of the Project Gutenberg EBook of Natural Philosophy, by Wilhelm Ostwald