CON TENTS of N° 299.— Fourth Series, 



XX. On the Optics of Mirage. By Professor Everett, M.A., 

 D.C.L., Queen's College, Belfast : page 161 



XXI. Correction to a Paper " On an Experimental Determination 

 of the Belation between the Energy and Apparent Intensity of 

 Sounds of different Pitch." By E. H. M. Bosanqtjet, Eellow of St. 

 John's College, Oxford 173 



XXII. On the Effect of Internal Friction on Eesonance. By J. 

 HoPEmsosr, D.Sc, B.A 176 



XXIII. On the Action of Solid Bodies on [Gaseous] Supersatu- 

 rated Solutions. By E. C. Henrici 183 



XXIY. On Arithmetical Irrationality. By J. W. L. Glaisher, 

 Eellow of Trinity College, Cambridge 191 



XXV. On a Method of Testing Submarine Telegraph Cables 

 during Paying-out. By Thomas T. P. Bruce Warren, Electrician 

 to Hooper's Telegraph Works, Limited ; Member of the Society of 

 Telegraph Engineers 199 



XXYI. On the Pressure required to give Eotation to Rifled Pro- 

 jectiles. By Captain Noble, E.E.S. &c. (late Eoyal Artillery). (With 

 a Plate.) 204 



XXVII. Note on the Measure of Intensity in the Theories of 

 Light and Sound. By E. H. M. Bosanqitet, Eellow of St. John's 

 College, Oxford 215 



XXVIII. Proceedings of Learned Societies : — 



Royal Society : — Mr. J. Stuart on the Attraction of a Gal- 

 vanic Coil on a small Magnetic Mass ; Messrs. J. N. Lockyer 

 and Gr. M. Seabroke on a new Method of viewing the Chro- 

 mosphere ; Mr. E. H. Wejstttam on a new Formula for a Mi- 

 croscope Object-glass 218-231 



Geological Society 231-235 



XXIX. Intelligence and Miscellaneous Articles : — 



On the Action of a Conductor arranged symmetrically round an 



Electroscope, by Ch. V. Zenger 235 



On the Heat of Transformation, by M. J. Moutier 236 



Eoyal Astronomical Society 239 



On the Determination of the Boiling-point of Liquefied Sul- 

 phurous Acid, by M. Is. Pierre 240 



* 



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