REGARDING ADDITIONAL READING 



THE articles contained in this volume first appeared in the follow- 

 ing publications: North American Review, Iron Age, Journal of the 

 Society of Arts, Science, Popular Science Monthly, Edinburgh Review, 

 St. Louis Globe-Democrat, Scientific American Supplement, Harper's 

 Monthly, Engineering, Prometheus, American Machinist, Kosmos, 

 Knowledge, Scientific News, New International Encyclopaedia, 

 McClure's Magazine and Transactions of the American Electro- 

 chemical Society. 



Those who wish to read more along general scientific lines will 

 find other interesting articles by referring to the files of these maga- 

 zines. See for instance, the following: "The Eenaissance of the 

 Alchemists, " North American Review, July, 1906. "Chemistry and 

 the World's Food the Fixation of Nitrogen," Harper's Monthly, 

 April, 1906. "The Chemistry of the Steam Boiler/ ' Scientific 

 American Supplement, December 11, 1909. "Flower Pigments," 

 Scientific American Supplement, April 10, 1909. Messrs. Munn & 

 Company, 361 Broadway, New York City, will send upon request a 

 complete index to the Scientific American Supplement, from which 

 readable articles may be found upon almost any subject in pure and 

 applied science. Individual numbers of the Supplement may be 

 purchased at ten cents each. By referring to the volume of the 

 New International Encyclopaedia entitled "Courses for Eeading and 

 Study, " one will find references to topics which will enable him to 

 inform himself upon almost any subject whatsoever, and he will 

 also find directions for pursuing an interesting and systematic 

 course of private study. At the end of the encyclopaedic articles 

 there is given the names of books which treat fully the topics under 

 consideration. The forthcoming eleventh edition of the Encyclo- 

 paedia Britannica should also be consulted. 



For a brief though broad view of the progress of Science, one may 

 read profitably The Progress of the Century, by various authors, 

 and The Story of Nineteenth Century Science, by H. S. Williams, 

 or others books of similar import. 



It is true that interest and profit come through reading about 

 matter and its manifestations, but the greatest inspiration comes 

 through reading of the lives and work of men whose labors have built 



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