The Works of Professor E. L. YOUMANS, M. D, 



Class-book of Chemistry. 



New edition. 12mo. Cloth, $1.50. 



The Hand-book of Household Science. 



A Popular Account of Heat, Light, Air, Aliment, and Cleansing, 

 in their Scientific Principles and Domestic Applications. 12mo. 

 Illustrated. Cloth, $1.75. 



The Culture demanded by Modern Life. 



A Series of Addresses and Arguments on the Claims of Scientific 

 Education. Edited, with an Introduction on Mental Discipline in 

 Education. 1 vol., 12mo. Cloth. $2.00. 



Correlation and Conservation of Forces. 



A Series of Expositions by Professor Grove, Professor Helmholtz, 

 Dr. Mayer, Dr. Faraday, Professor Liebig, and Dr. Carpenter. 

 Edited, with an Introduction and Brief Biographical Notices of 

 the Chief Promoters of the New Views, by EDWARD L. YOUMANS, 

 M.D. 1 vol., 12mo. Cloth, $2.00. 



The Popular Science Monthly. 



Conducted by E. L. and W. J. YOUMANS. 



Containing instructive and interesting articles and abstracts of articles, 

 original, selected, and illustrated, from the pens of the leading scientific 

 men of different countries ; 



Accounts of important scientific discoveries ; 



The application of science to the practical arts ; 



The latest views put forth concerning natural phenomena, by savants 

 of the highest authority. 



TERMS : Five dollars per annum ; or fifty cents per number. A Club 

 of five will be sent to any address for $20.00 per annum. 



The volumes begin May and November of each year. Subscriptions 

 may begin at any time. 



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