6 TEXT-BOOKS OF SCIENCE 



HAKPEE'S SCIENTIFIC MEMOIRS 



A new series of translations and reprints of scientific papers, many 

 of wliich have never before appeared in English, and consequently 

 have been practically inaccessible to the great majority of American 

 students. They will embrace articles from the fields of Physics, 

 Astronomy, and Chemistry, and probably other sciences. 



The following Volumes are now ready or in prepa/ration : 



The Free Expansion of Gases. Memoirs by Gay- 

 Lussac, Joule, and Joule and Thomson. Editor, Joseph 

 S. Ames, Ph.D., Johns Hopkins University, pp. 114. 

 75 cents ; by mail, 83 cents. 



Prismatic akd Diffraction Spectra. Memoirs by 

 Joseph von Praunhofer. Editor, Joseph S. Ames, 

 Ph.D., Johns Hopkins University, pp. 76. 60 cents ; 

 by mail, 66 cents. 



Eontgen Eays. Memoirs by Kontgen, Stolies, and J. J. 

 Thomson. Editor, Prof. George F. Barker, Univer- 

 sity of Penn. pp. viii., 76. 60 cents; by mail, 65 cents. 



The Modern Theory of Solution. Memoirs by Pfef- 

 fer, Van't HofE, Arrhenius, and Kaoult. Editor, Dr. 

 H. C. Jones, Johns Hopkins University, pp. xiii., 134. 

 $1 00; by mail, $1 07. 



On the Laws of Gases. Memoirs by Boyle, Amagat, 

 and Gay-Lussac. Editor, Prof. Carl Barus, Brown 

 University. ' 



Newton's Law of Gravitation. Editor, Prof. A. S. 

 Mackenzie, Bryn Mawr College. 



The Second Law of Thermodynamics. Memoirs by 

 Carnot, Clausius, and Thomson. Editor, Prof. W. F. 

 Magie, Princeton University. 



On the Properties of Ions. Memoirs by Kohlransch 

 and Hittorf. Editor, Dr. H. M. Goodwin, Massachu- 

 setts Institute of Technology. 



The Faraday and Zeeman Effects. Memoirs by Far- 

 aday, Kerr, and Zeeman. Editor, Dr. E. P. Lewis, 

 University of California. 



Wave-Theory of Light. Memoirs by Young andFresnel. 



Editor, Prof. Henry Crew, Northwestern University. 



Uniform in size and style. 8vo, Cloth. 



NEW YORK HARPER & BROTHERS London 



