Transcriber’s Note: Punctuation has been standardised. Spelling and hyphenation have been retained as they appear in the original publication except as follows: Page 26 two to three in cm. width over _changed to_ two to three cm. in width over Page 30 on the mercury and quntiaty of air _changed to_ on the mercury and quantity of air Page 38 may be also used in photo-zylography _changed to_ may be also used in photo-xylography Page 97 with a mat surface or varnished _changed to_ with a matt surface or varnished Page 103 The Artotype Co. take _changed to_ The Artotype Co. takes Page 107 If this fail to produce sufficient _changed to_ If this fails to produce sufficient Page 122 we owe the orgination of this _changed to_ we owe the origination of this develope the invisible image _changed to_ develop the invisible image Page 126 60° Reamur _changed to_ 60° Réamur Advertisements DÖESENER WEG, LEIPSIG. _changed to_ DÖSENER WEG, LEIPZIG. LEIPSIC, GERMANY, _changed to_ LEIPZIG, GERMANY, INKS, ROLLERS, CHEMICAL S _changed to_ INKS, ROLLERS, CHEMICALS Schweinfurt a/ Maine _changed to_ Schweinfurt a/ Main A. & M. ZMIMERMANN _changed to_ A. & M. ZIMMERMANN End of Project Gutenberg's Collotype and Photo-lithography, by Julius Schnauss