CONTENTS of N° 297.— Fourth Series. 



I. On Manometric Flames. By Dr. Ktjdolph Kohtg (of Paris). 

 (With a Plate.) page 1 



II. On an Acoustic Pyrometer. By Alered M. Mayer, Ph.D., 

 Member of the National Academy of Sciences, Professor of Physics 

 in the Stevens Institute of Technology, Hoboken, New Jersey, 

 U.S.A. (With a Plate.) 18 



III. The Chemistry of Sulphuric Acid-manufacture. By H. A. 

 Smith 23 



IV. On the Definition of Intensity in the Theories of Light and 

 Sound. By Robert Moon, M.A., Honorary Fellow of Queen's Col- 

 lege, Cambridge 38 



V. On the Magnetizing-Function of Soft Iron, especially with 

 weaker decomposing-powers. By Dr. A. Stoletow, of the "University 



of Moscow. (With a Plate.) 40 



VI. Experiments on Fluorescence. By Edtjard Hagejn-bach .... 57 



VII. Notices respecting New Books : — The Earth a Great Magnet. 

 By Alfred Marshall Mater, Ph.D., Professor of Physics in the 

 Stevens Institute of Technology. — War Department Weather Maps. 

 Signal-Service, United-States Army. Friday, November 22, 1872. — 

 The Atmosphere of the Sun. The Bede Lecture, 1871. By J. Nor- 

 man Lockyer, F.E.S 65 



VIII. Proceedings of Learned Societies : — 



Koyal Society : — Mr. Archibald Liyersiege on Supersatu- 

 rated Saline Solutions 67 



IX. Intelligence and Miscellaneous Articles : — 



On the Distribution of Magnetism, by M. Jamin 76 



Belation between the Pressure and the Volume of Saturated 

 Aqueous Vapour which expands in producing Work with 

 neither addition nor subtraction of Heat, by H. Eesal 77 



On the Definition of Temperature in the Mechanical Theory of 

 Heat, and the Physical Interpretation of the Second Funda- 

 mental Principle of that Theory, by E. Mallard 77 



On Electro-magnetism, by M. Treve 80 



It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



