IV CONTENTS OF VOL. XLVI. FOURTH SERIES. 



Page 

 Mr. J. W. L. Glaisher on the Form of the Cells of Bees .... 103 

 Mr. E. Moon on the Integration of the Accurate Equation 

 representing the Transmission in one direction of Sound 



through Air, deduced on the Ordinary Theory 122 



Prof. J. D. Dana on some Eesults of the Earth's Contraction 

 from Cooling, including a discussion of the Origin of Moun- 

 tains 131 



Mr. H. A. Eowland on Magnetic Permeability, and the Maxi- 

 mum of Magnetism of Iron, Steel, and Nickel (With Two 



Plates.) 140 



Prof. Challis on Objections recently made to the received 



principles of Hydrodynamics 159 



Lord Eayleigh on the Nodal Lines of a Square Plate 166 



Notices respecting New Books : — 



Astronomical and Meteorological Observations made du- 

 ring the year 1870, at the United States Naval Obser- 

 vatory 171 



Proceedings of the Geological Society : — 



Mr. C. J. A. Meyer on the Punfield Section 173 



Mr. W. J. Sollas on the Coprolites of the Upper Green- 

 sand Formation, and on Flints 173 



On a new Method for examining the divisions of Graduated 



Circles, by G. Quincke 174 



On a convenient Eyepiece-micrometer for the Spectroscope, by 



Professor O. N.'Eood 176 



On Jamin's Compound Magnets, by E. S. Culley, Esq 176 



NUMBEE CCCY.— SEPTEMBEE. 



Prof. A. M. Mayer on the Effects of Magnetization in changing 

 the Dimensions of Iron and Steel Bars, and in increasing 

 the Interior Capacity of Hollow Iron Cylinders 177 



M. E. Edlund's Inquiry into the Nature of Galvanic Eesist- 

 ance, together with a Theoretic Deduction of Ohm's Law 

 and the Formula for the Heat developed by a Galvanic 

 Current 201 



Prof. J. D. Dana on some Eesults of the Earth's Contraction 

 from Cooling, including a discussion of the Origin of Moun- 

 tains. — Part II. The Condition of the Earth's Interior, and 

 the connexion of the facts with Mountain-making. — Part III. 

 Metamorphism 210 



Mr. E. Moon on the Measure of Work in the Theory of Energy. 219 



The Astronomer Eoyal's Experiments on the Directive Power 

 of large Steel Magnets, of Bars of Magnetized Soft Iron, 

 and of Galvanic Coils, in their Action on external small Mag- 

 nets. — With Appendix, by Mr. J. Stuart, containing an In- 

 vestigation of the Attraction of a Galvanic Coil on a small 

 Magnetic Mass 221 



