Transcriber's Notes
The following typographical corrections have been made:
[Page x]: Heat without combustion—Inter-currents{original had no hyphen; changed to match page 45, to which it refers}
[Page xiii]: The fifth plate (from the Addendum) has been added to the list of illustrations.
[Page 60]: back and forth to maintain an{comma removed} equilibrium.
[Page 64]: {quotation mark removed}The course of a balloonist
[Page 102]: {quotation mark added}"These clouds sometimes range themselves
[Page 107]: {quotation mark added}"The overwhelming probability of a common cause
The following inconsistent hyphenation is as printed:
[Page 42]: just such a retro-acting inter-communication.
[Page 72]: might interfere with the intercommunication of light