Obvious punctuation errors have been corrected.

Spelling inconsistencies have been retained.

The picture of a pointing finger, known in typography as an index, a manicule, or a fist, has been rendered in this version as "=>".

On page 83, the clause "It has an independent extinguisher for the smaller wick tube" had "ndependent" in the original.

On page 90, the illustration of the transit of Jupiter by a dark body is reversed, as it was in the original.

On page 91, the ad reading "The Turbine Wheel made by Risdon & Co., Mt. Holly, N. J., gave the best results at Centennial tests." had "tets" in the original.

On page 92, the patent named "Gas, scintillator for lighting" was numbered "204,28" in the original. The final "5" has been added because sorting the list reveals that the patent numbers form a consecutive series from 204,122 to 204,413, with the only one missing being 204,285.

On page 92, the patent named "Shoetip" was guessed at; the "t" is unclear in the original.

On page 93, the ink blot partially obscuring the 'B' in "Burnham's" was present in the original.

On page 93, in the ad starting "State, County and Shop Rights For Sale", the abbreviation for "Illinois" has been changed from an unclear "I l." in the original to "Ill.", as the state is otherwise abbreviated throughout the original.

On page 94, the phrase "Alcohol Oxidized in the System." had no terminating punctuation in the original.